diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 5ae2999..33d1eeb 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -1267,7 +1267,8 @@
         return parentFrameRate;
     }();
 
-    *transactionNeeded |= setFrameRateForLayerTreeLegacy(frameRate);
+    auto now = systemTime();
+    *transactionNeeded |= setFrameRateForLayerTreeLegacy(frameRate, now);
 
     // The frame rate is propagated to the children
     bool childrenHaveFrameRate = false;
@@ -1283,7 +1284,8 @@
     // layer as NoVote to allow the children to control the refresh rate
     if (!frameRate.isValid() && childrenHaveFrameRate) {
         *transactionNeeded |=
-                setFrameRateForLayerTreeLegacy(FrameRate(Fps(), FrameRateCompatibility::NoVote));
+                setFrameRateForLayerTreeLegacy(FrameRate(Fps(), FrameRateCompatibility::NoVote),
+                                               now);
     }
 
     // We return whether this layer or its children has a vote. We ignore ExactOrMultiple votes for
@@ -1492,7 +1494,7 @@
     addSurfaceFrameDroppedForBuffer(surfaceFrame, postTime);
 }
 
-bool Layer::setFrameRateForLayerTreeLegacy(FrameRate frameRate) {
+bool Layer::setFrameRateForLayerTreeLegacy(FrameRate frameRate, nsecs_t now) {
     if (mDrawingState.frameRateForLayerTree == frameRate) {
         return false;
     }
@@ -1506,19 +1508,20 @@
     setTransactionFlags(eTransactionNeeded);
 
     mFlinger->mScheduler
-            ->recordLayerHistory(sequence, getLayerProps(), systemTime(),
+            ->recordLayerHistory(sequence, getLayerProps(), now, now,
                                  scheduler::LayerHistory::LayerUpdateType::SetFrameRate);
     return true;
 }
 
-bool Layer::setFrameRateForLayerTree(FrameRate frameRate, const scheduler::LayerProps& layerProps) {
+bool Layer::setFrameRateForLayerTree(FrameRate frameRate, const scheduler::LayerProps& layerProps,
+                                     nsecs_t now) {
     if (mDrawingState.frameRateForLayerTree == frameRate) {
         return false;
     }
 
     mDrawingState.frameRateForLayerTree = frameRate;
     mFlinger->mScheduler
-            ->recordLayerHistory(sequence, layerProps, systemTime(),
+            ->recordLayerHistory(sequence, layerProps, now, now,
                                  scheduler::LayerHistory::LayerUpdateType::SetFrameRate);
     return true;
 }
@@ -3225,7 +3228,7 @@
                                       mOwnerUid, postTime, getGameMode());
 
     if (mFlinger->mLegacyFrontEndEnabled) {
-        recordLayerHistoryBufferUpdate(getLayerProps());
+        recordLayerHistoryBufferUpdate(getLayerProps(), systemTime());
     }
 
     setFrameTimelineVsyncForBufferTransaction(info, postTime);
@@ -3256,7 +3259,7 @@
     mDrawingState.isAutoTimestamp = isAutoTimestamp;
 }
 
-void Layer::recordLayerHistoryBufferUpdate(const scheduler::LayerProps& layerProps) {
+void Layer::recordLayerHistoryBufferUpdate(const scheduler::LayerProps& layerProps, nsecs_t now) {
     ATRACE_CALL();
     const nsecs_t presentTime = [&] {
         if (!mDrawingState.isAutoTimestamp) {
@@ -3310,14 +3313,14 @@
         ATRACE_FORMAT_INSTANT("presentIn %s", to_string(presentIn).c_str());
     }
 
-    mFlinger->mScheduler->recordLayerHistory(sequence, layerProps, presentTime,
+    mFlinger->mScheduler->recordLayerHistory(sequence, layerProps, presentTime, now,
                                              scheduler::LayerHistory::LayerUpdateType::Buffer);
 }
 
-void Layer::recordLayerHistoryAnimationTx(const scheduler::LayerProps& layerProps) {
+void Layer::recordLayerHistoryAnimationTx(const scheduler::LayerProps& layerProps, nsecs_t now) {
     const nsecs_t presentTime =
             mDrawingState.isAutoTimestamp ? 0 : mDrawingState.desiredPresentTime;
-    mFlinger->mScheduler->recordLayerHistory(sequence, layerProps, presentTime,
+    mFlinger->mScheduler->recordLayerHistory(sequence, layerProps, presentTime, now,
                                              scheduler::LayerHistory::LayerUpdateType::AnimationTX);
 }
 
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 78a3a7c..0b66866 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -908,10 +908,10 @@
     void callReleaseBufferCallback(const sp<ITransactionCompletedListener>& listener,
                                    const sp<GraphicBuffer>& buffer, uint64_t framenumber,
                                    const sp<Fence>& releaseFence);
-    bool setFrameRateForLayerTreeLegacy(FrameRate);
-    bool setFrameRateForLayerTree(FrameRate, const scheduler::LayerProps&);
-    void recordLayerHistoryBufferUpdate(const scheduler::LayerProps&);
-    void recordLayerHistoryAnimationTx(const scheduler::LayerProps&);
+    bool setFrameRateForLayerTreeLegacy(FrameRate, nsecs_t now);
+    bool setFrameRateForLayerTree(FrameRate, const scheduler::LayerProps&, nsecs_t now);
+    void recordLayerHistoryBufferUpdate(const scheduler::LayerProps&, nsecs_t now);
+    void recordLayerHistoryAnimationTx(const scheduler::LayerProps&, nsecs_t now);
     auto getLayerProps() const {
         return scheduler::LayerProps{
                 .visible = isVisible(),
diff --git a/services/surfaceflinger/Scheduler/LayerHistory.h b/services/surfaceflinger/Scheduler/LayerHistory.h
index 40bda83..bac1ec6 100644
--- a/services/surfaceflinger/Scheduler/LayerHistory.h
+++ b/services/surfaceflinger/Scheduler/LayerHistory.h
@@ -91,6 +91,7 @@
 
 private:
     friend class LayerHistoryTest;
+    friend class LayerHistoryIntegrationTest;
     friend class TestableScheduler;
 
     using LayerPair = std::pair<Layer*, std::unique_ptr<LayerInfo>>;
diff --git a/services/surfaceflinger/Scheduler/LayerInfo.h b/services/surfaceflinger/Scheduler/LayerInfo.h
index 6286b28..d580b58 100644
--- a/services/surfaceflinger/Scheduler/LayerInfo.h
+++ b/services/surfaceflinger/Scheduler/LayerInfo.h
@@ -62,6 +62,7 @@
     static constexpr size_t kNumSmallDirtyThreshold = 2;
 
     friend class LayerHistoryTest;
+    friend class LayerHistoryIntegrationTest;
     friend class LayerInfoTest;
 
 public:
@@ -264,6 +265,7 @@
 
     private:
         friend class LayerHistoryTest;
+        friend class LayerHistoryIntegrationTest;
 
         // Holds the refresh rate when it was calculated
         struct RefreshRateData {
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 76f1af9..daf9898 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -625,9 +625,9 @@
 }
 
 void Scheduler::recordLayerHistory(int32_t id, const LayerProps& layerProps, nsecs_t presentTime,
-                                   LayerHistory::LayerUpdateType updateType) {
+                                   nsecs_t now, LayerHistory::LayerUpdateType updateType) {
     if (pacesetterSelectorPtr()->canSwitch()) {
-        mLayerHistory.record(id, layerProps, presentTime, systemTime(), updateType);
+        mLayerHistory.record(id, layerProps, presentTime, now, updateType);
     }
 }
 
diff --git a/services/surfaceflinger/Scheduler/Scheduler.h b/services/surfaceflinger/Scheduler/Scheduler.h
index e6db654..3441318 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.h
+++ b/services/surfaceflinger/Scheduler/Scheduler.h
@@ -230,7 +230,7 @@
     // Layers are registered on creation, and unregistered when the weak reference expires.
     void registerLayer(Layer*);
     void recordLayerHistory(int32_t id, const LayerProps& layerProps, nsecs_t presentTime,
-                            LayerHistory::LayerUpdateType) EXCLUDES(mDisplayLock);
+                            nsecs_t now, LayerHistory::LayerUpdateType) EXCLUDES(mDisplayLock);
     void setModeChangePending(bool pending);
     void setDefaultFrameRateCompatibility(int32_t id, scheduler::FrameRateCompatibility);
     void deregisterLayer(Layer*);
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 4d8dc94..e32e0fd 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2203,44 +2203,46 @@
     return mustComposite;
 }
 
-void SurfaceFlinger::updateLayerHistory(const frontend::LayerSnapshot& snapshot) {
-    using Changes = frontend::RequestedLayerState::Changes;
-    if (snapshot.path.isClone()) {
-        return;
-    }
+void SurfaceFlinger::updateLayerHistory(nsecs_t now) {
+    for (const auto& snapshot : mLayerSnapshotBuilder.getSnapshots()) {
+        using Changes = frontend::RequestedLayerState::Changes;
+        if (snapshot->path.isClone()) {
+            continue;
+        }
 
-    if (!snapshot.changes.any(Changes::FrameRate | Changes::Buffer | Changes::Animation) &&
-        (snapshot.clientChanges & layer_state_t::eDefaultFrameRateCompatibilityChanged) == 0) {
-        return;
-    }
+        if (!snapshot->changes.any(Changes::FrameRate | Changes::Buffer | Changes::Animation) &&
+            (snapshot->clientChanges & layer_state_t::eDefaultFrameRateCompatibilityChanged) == 0) {
+            continue;
+        }
 
-    const auto layerProps = scheduler::LayerProps{
-            .visible = snapshot.isVisible,
-            .bounds = snapshot.geomLayerBounds,
-            .transform = snapshot.geomLayerTransform,
-            .setFrameRateVote = snapshot.frameRate,
-            .frameRateSelectionPriority = snapshot.frameRateSelectionPriority,
-    };
+        const auto layerProps = scheduler::LayerProps{
+                .visible = snapshot->isVisible,
+                .bounds = snapshot->geomLayerBounds,
+                .transform = snapshot->geomLayerTransform,
+                .setFrameRateVote = snapshot->frameRate,
+                .frameRateSelectionPriority = snapshot->frameRateSelectionPriority,
+        };
 
-    auto it = mLegacyLayers.find(snapshot.sequence);
-    LOG_ALWAYS_FATAL_IF(it == mLegacyLayers.end(), "Couldnt find layer object for %s",
-                        snapshot.getDebugString().c_str());
+        auto it = mLegacyLayers.find(snapshot->sequence);
+        LOG_ALWAYS_FATAL_IF(it == mLegacyLayers.end(), "Couldnt find layer object for %s",
+                            snapshot->getDebugString().c_str());
 
-    if (snapshot.changes.test(Changes::Animation)) {
-        it->second->recordLayerHistoryAnimationTx(layerProps);
-    }
+        if (snapshot->clientChanges & layer_state_t::eDefaultFrameRateCompatibilityChanged) {
+            mScheduler->setDefaultFrameRateCompatibility(snapshot->sequence,
+                                                         snapshot->defaultFrameRateCompatibility);
+        }
 
-    if (snapshot.clientChanges & layer_state_t::eDefaultFrameRateCompatibilityChanged) {
-        mScheduler->setDefaultFrameRateCompatibility(snapshot.sequence,
-                                                     snapshot.defaultFrameRateCompatibility);
-    }
+        if (snapshot->changes.test(Changes::Animation)) {
+            it->second->recordLayerHistoryAnimationTx(layerProps, now);
+        }
 
-    if (snapshot.changes.test(Changes::FrameRate)) {
-        it->second->setFrameRateForLayerTree(snapshot.frameRate, layerProps);
-    }
+        if (snapshot->changes.test(Changes::FrameRate)) {
+            it->second->setFrameRateForLayerTree(snapshot->frameRate, layerProps, now);
+        }
 
-    if (snapshot.changes.test(Changes::Buffer)) {
-        it->second->recordLayerHistoryBufferUpdate(layerProps);
+        if (snapshot->changes.test(Changes::Buffer)) {
+            it->second->recordLayerHistoryBufferUpdate(layerProps, now);
+        }
     }
 }
 
@@ -2379,8 +2381,8 @@
             mLayersIdsWithQueuedFrames.emplace(it->second->sequence);
         }
 
+        updateLayerHistory(latchTime);
         mLayerSnapshotBuilder.forEachVisibleSnapshot([&](const frontend::LayerSnapshot& snapshot) {
-            updateLayerHistory(snapshot);
             if (mLayersIdsWithQueuedFrames.find(snapshot.path.id) ==
                 mLayersIdsWithQueuedFrames.end())
                 return;
@@ -4832,7 +4834,7 @@
     for (const auto& listener : listenerCallbacks) {
         mTransactionCallbackInvoker.addEmptyTransaction(listener);
     }
-
+    nsecs_t now = systemTime();
     uint32_t clientStateFlags = 0;
     for (auto& resolvedState : states) {
         if (mLegacyFrontEndEnabled) {
@@ -4854,7 +4856,7 @@
                         .setFrameRateVote = layer->getFrameRateForLayerTree(),
                         .frameRateSelectionPriority = layer->getFrameRateSelectionPriority(),
                 };
-                layer->recordLayerHistoryAnimationTx(layerProps);
+                layer->recordLayerHistoryAnimationTx(layerProps, now);
             }
         }
     }
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index a5a2341..7b2d590 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -732,7 +732,7 @@
                                     bool& out) REQUIRES(kMainThreadContext);
     bool updateLayerSnapshots(VsyncId vsyncId, nsecs_t frameTimeNs, bool transactionsFlushed,
                               bool& out) REQUIRES(kMainThreadContext);
-    void updateLayerHistory(const frontend::LayerSnapshot& snapshot);
+    void updateLayerHistory(nsecs_t now);
     frontend::Update flushLifecycleUpdates() REQUIRES(kMainThreadContext);
 
     void updateInputFlinger(VsyncId vsyncId, TimePoint frameTime);
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index f4516c7..858b882 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -93,6 +93,7 @@
         "HWComposerTest.cpp",
         "OneShotTimerTest.cpp",
         "LayerHistoryTest.cpp",
+        "LayerHistoryIntegrationTest.cpp",
         "LayerInfoTest.cpp",
         "LayerMetadataTest.cpp",
         "LayerHierarchyTest.cpp",
diff --git a/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h b/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h
index d7ac038..27961fa 100644
--- a/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h
+++ b/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h
@@ -18,11 +18,13 @@
 #include <gtest/gtest.h>
 
 #include <gui/fake/BufferData.h>
+#include <renderengine/mock/FakeExternalTexture.h>
 
 #include "Client.h" // temporarily needed for LayerCreationArgs
 #include "FrontEnd/LayerCreationArgs.h"
 #include "FrontEnd/LayerHierarchy.h"
 #include "FrontEnd/LayerLifecycleManager.h"
+#include "FrontEnd/LayerSnapshotBuilder.h"
 
 namespace android::surfaceflinger::frontend {
 
@@ -358,6 +360,19 @@
         mLifecycleManager.applyTransactions(transactions);
     }
 
+    void setDefaultFrameRateCompatibility(uint32_t id, int8_t defaultFrameRateCompatibility) {
+        std::vector<TransactionState> transactions;
+        transactions.emplace_back();
+        transactions.back().states.push_back({});
+
+        transactions.back().states.front().state.what =
+                layer_state_t::eDefaultFrameRateCompatibilityChanged;
+        transactions.back().states.front().layerId = id;
+        transactions.back().states.front().state.defaultFrameRateCompatibility =
+                defaultFrameRateCompatibility;
+        mLifecycleManager.applyTransactions(transactions);
+    }
+
     void setRoundedCorners(uint32_t id, float radius) {
         std::vector<TransactionState> transactions;
         transactions.emplace_back();
@@ -384,6 +399,16 @@
         mLifecycleManager.applyTransactions(transactions);
     }
 
+    void setBuffer(uint32_t id) {
+        static uint64_t sBufferId = 1;
+        setBuffer(id,
+                  std::make_shared<renderengine::mock::
+                                           FakeExternalTexture>(1U /*width*/, 1U /*height*/,
+                                                                sBufferId++,
+                                                                HAL_PIXEL_FORMAT_RGBA_8888,
+                                                                GRALLOC_USAGE_PROTECTED /*usage*/));
+    }
+
     void setBufferCrop(uint32_t id, const Rect& bufferCrop) {
         std::vector<TransactionState> transactions;
         transactions.emplace_back();
@@ -409,4 +434,50 @@
     LayerLifecycleManager mLifecycleManager;
 };
 
+class LayerSnapshotTestBase : public LayerHierarchyTestBase {
+protected:
+    LayerSnapshotTestBase() : LayerHierarchyTestBase() {}
+
+    void createRootLayer(uint32_t id) override {
+        LayerHierarchyTestBase::createRootLayer(id);
+        setColor(id);
+    }
+
+    void createLayer(uint32_t id, uint32_t parentId) override {
+        LayerHierarchyTestBase::createLayer(id, parentId);
+        setColor(parentId);
+    }
+
+    void mirrorLayer(uint32_t id, uint32_t parent, uint32_t layerToMirror) override {
+        LayerHierarchyTestBase::mirrorLayer(id, parent, layerToMirror);
+        setColor(id);
+    }
+
+    void update(LayerSnapshotBuilder& snapshotBuilder) {
+        if (mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy)) {
+            mHierarchyBuilder.update(mLifecycleManager.getLayers(),
+                                     mLifecycleManager.getDestroyedLayers());
+        }
+        LayerSnapshotBuilder::Args args{.root = mHierarchyBuilder.getHierarchy(),
+                                        .layerLifecycleManager = mLifecycleManager,
+                                        .includeMetadata = false,
+                                        .displays = mFrontEndDisplayInfos,
+                                        .displayChanges = mHasDisplayChanges,
+                                        .globalShadowSettings = globalShadowSettings,
+                                        .supportsBlur = true,
+                                        .supportedLayerGenericMetadata = {},
+                                        .genericLayerMetadataKeyMap = {}};
+        snapshotBuilder.update(args);
+
+        mLifecycleManager.commitChanges();
+    }
+
+    LayerHierarchyBuilder mHierarchyBuilder{{}};
+
+    DisplayInfos mFrontEndDisplayInfos;
+    bool mHasDisplayChanges = false;
+
+    renderengine::ShadowSettings globalShadowSettings;
+};
+
 } // namespace android::surfaceflinger::frontend
diff --git a/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp b/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp
new file mode 100644
index 0000000..a462082
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp
@@ -0,0 +1,873 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "LayerHistoryIntegrationTest"
+
+#include <Layer.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <log/log.h>
+
+#include <renderengine/mock/FakeExternalTexture.h>
+
+#include "FpsOps.h"
+#include "LayerHierarchyTest.h"
+#include "Scheduler/LayerHistory.h"
+#include "Scheduler/LayerInfo.h"
+#include "TestableScheduler.h"
+#include "TestableSurfaceFlinger.h"
+#include "mock/DisplayHardware/MockDisplayMode.h"
+#include "mock/MockSchedulerCallback.h"
+
+namespace android::scheduler {
+
+using android::mock::createDisplayMode;
+
+class LayerHistoryIntegrationTest : public surfaceflinger::frontend::LayerSnapshotTestBase {
+protected:
+    static constexpr auto PRESENT_TIME_HISTORY_SIZE = LayerInfo::HISTORY_SIZE;
+    static constexpr auto MAX_FREQUENT_LAYER_PERIOD_NS = LayerInfo::kMaxPeriodForFrequentLayerNs;
+    static constexpr auto FREQUENT_LAYER_WINDOW_SIZE = LayerInfo::kFrequentLayerWindowSize;
+    static constexpr auto PRESENT_TIME_HISTORY_DURATION = LayerInfo::HISTORY_DURATION;
+
+    static constexpr Fps LO_FPS = 30_Hz;
+    static constexpr auto LO_FPS_PERIOD = LO_FPS.getPeriodNsecs();
+
+    static constexpr Fps HI_FPS = 90_Hz;
+    static constexpr auto HI_FPS_PERIOD = HI_FPS.getPeriodNsecs();
+
+    LayerHistoryIntegrationTest() : LayerSnapshotTestBase() {
+        mFlinger.resetScheduler(mScheduler);
+        mLifecycleManager = {};
+        mHierarchyBuilder = {{}};
+    }
+
+    void updateLayerSnapshotsAndLayerHistory(nsecs_t now) {
+        LayerSnapshotTestBase::update(mFlinger.mutableLayerSnapshotBuilder());
+        mFlinger.updateLayerHistory(now);
+    }
+
+    void setBufferWithPresentTime(sp<Layer>& layer, nsecs_t time) {
+        uint32_t sequence = static_cast<uint32_t>(layer->sequence);
+        setBuffer(sequence);
+        layer->setDesiredPresentTime(time, false /*autotimestamp*/);
+        updateLayerSnapshotsAndLayerHistory(time);
+    }
+
+    LayerHistory& history() { return mScheduler->mutableLayerHistory(); }
+    const LayerHistory& history() const { return mScheduler->mutableLayerHistory(); }
+
+    LayerHistory::Summary summarizeLayerHistory(nsecs_t now) {
+        // LayerHistory::summarize makes no guarantee of the order of the elements in the summary
+        // however, for testing only, a stable order is required, therefore we sort the list here.
+        // Any tests requiring ordered results must create layers with names.
+        auto summary = history().summarize(*mScheduler->refreshRateSelector(), now);
+        std::sort(summary.begin(), summary.end(),
+                  [](const RefreshRateSelector::LayerRequirement& lhs,
+                     const RefreshRateSelector::LayerRequirement& rhs) -> bool {
+                      return lhs.name < rhs.name;
+                  });
+        return summary;
+    }
+
+    size_t layerCount() const { return mScheduler->layerHistorySize(); }
+    size_t activeLayerCount() const NO_THREAD_SAFETY_ANALYSIS {
+        return history().mActiveLayerInfos.size();
+    }
+
+    auto frequentLayerCount(nsecs_t now) const NO_THREAD_SAFETY_ANALYSIS {
+        const auto& infos = history().mActiveLayerInfos;
+        return std::count_if(infos.begin(), infos.end(), [now](const auto& pair) {
+            return pair.second.second->isFrequent(now).isFrequent;
+        });
+    }
+
+    auto animatingLayerCount(nsecs_t now) const NO_THREAD_SAFETY_ANALYSIS {
+        const auto& infos = history().mActiveLayerInfos;
+        return std::count_if(infos.begin(), infos.end(), [now](const auto& pair) {
+            return pair.second.second->isAnimating(now);
+        });
+    }
+
+    auto clearLayerHistoryCount(nsecs_t now) const NO_THREAD_SAFETY_ANALYSIS {
+        const auto& infos = history().mActiveLayerInfos;
+        return std::count_if(infos.begin(), infos.end(), [now](const auto& pair) {
+            return pair.second.second->isFrequent(now).clearHistory;
+        });
+    }
+
+    void setDefaultLayerVote(Layer* layer,
+                             LayerHistory::LayerVoteType vote) NO_THREAD_SAFETY_ANALYSIS {
+        auto [found, layerPair] = history().findLayer(layer->getSequence());
+        if (found != LayerHistory::LayerStatus::NotFound) {
+            layerPair->second->setDefaultLayerVote(vote);
+        }
+    }
+
+    auto createLegacyAndFrontedEndLayer(uint32_t sequence) {
+        std::string layerName = "test layer:" + std::to_string(sequence);
+        const auto layer =
+                sp<Layer>::make(LayerCreationArgs{mFlinger.flinger(),
+                                                  nullptr,
+                                                  layerName,
+                                                  0,
+                                                  {},
+                                                  std::make_optional<uint32_t>(sequence)});
+        mFlinger.injectLegacyLayer(layer);
+        createRootLayer(sequence);
+        return layer;
+    }
+
+    auto destroyLayer(sp<Layer>& layer) {
+        uint32_t sequence = static_cast<uint32_t>(layer->sequence);
+        mFlinger.releaseLegacyLayer(sequence);
+        layer.clear();
+        destroyLayerHandle(sequence);
+    }
+
+    void recordFramesAndExpect(sp<Layer>& layer, nsecs_t& time, Fps frameRate,
+                               Fps desiredRefreshRate, int numFrames) {
+        LayerHistory::Summary summary;
+        for (int i = 0; i < numFrames; i++) {
+            setBufferWithPresentTime(layer, time);
+            time += frameRate.getPeriodNsecs();
+
+            summary = summarizeLayerHistory(time);
+        }
+
+        ASSERT_EQ(1u, summary.size());
+        ASSERT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+        ASSERT_EQ(desiredRefreshRate, summary[0].desiredRefreshRate);
+    }
+
+    std::shared_ptr<RefreshRateSelector> mSelector =
+            std::make_shared<RefreshRateSelector>(makeModes(createDisplayMode(DisplayModeId(0),
+                                                                              LO_FPS),
+                                                            createDisplayMode(DisplayModeId(1),
+                                                                              HI_FPS)),
+                                                  DisplayModeId(0));
+
+    mock::SchedulerCallback mSchedulerCallback;
+
+    TestableScheduler* mScheduler = new TestableScheduler(mSelector, mSchedulerCallback);
+
+    TestableSurfaceFlinger mFlinger;
+};
+
+namespace {
+
+TEST_F(LayerHistoryIntegrationTest, singleLayerNoVoteDefaultCompatibility) {
+    createLegacyAndFrontedEndLayer(1);
+    nsecs_t time = systemTime();
+
+    updateLayerSnapshotsAndLayerHistory(time);
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    // No layers returned if no layers are active.
+    EXPECT_TRUE(summarizeLayerHistory(time).empty());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    setBuffer(1);
+    setDefaultFrameRateCompatibility(1, ANATIVEWINDOW_FRAME_RATE_NO_VOTE);
+    updateLayerSnapshotsAndLayerHistory(time);
+
+    EXPECT_TRUE(summarizeLayerHistory(time).empty());
+    EXPECT_EQ(1u, activeLayerCount());
+}
+
+TEST_F(LayerHistoryIntegrationTest, singleLayerMinVoteDefaultCompatibility) {
+    createLegacyAndFrontedEndLayer(1);
+    nsecs_t time = systemTime();
+    updateLayerSnapshotsAndLayerHistory(time);
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    EXPECT_TRUE(summarizeLayerHistory(time).empty());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    setBuffer(1);
+    setDefaultFrameRateCompatibility(1, ANATIVEWINDOW_FRAME_RATE_MIN);
+    updateLayerSnapshotsAndLayerHistory(time);
+
+    auto summary = summarizeLayerHistory(time);
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+}
+
+TEST_F(LayerHistoryIntegrationTest, oneInvisibleLayer) {
+    createLegacyAndFrontedEndLayer(1);
+    nsecs_t time = systemTime();
+    updateLayerSnapshotsAndLayerHistory(time);
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    setBuffer(1);
+    updateLayerSnapshotsAndLayerHistory(time);
+    auto summary = summarizeLayerHistory(time);
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    // Layer is still considered inactive so we expect to get Min
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+
+    hideLayer(1);
+    setBuffer(1);
+    updateLayerSnapshotsAndLayerHistory(time);
+
+    summary = summarizeLayerHistory(time);
+    EXPECT_TRUE(summarizeLayerHistory(time).empty());
+    EXPECT_EQ(0u, activeLayerCount());
+}
+
+TEST_F(LayerHistoryIntegrationTest, oneLayerExplicitVote) {
+    createLegacyAndFrontedEndLayer(1);
+    setFrameRate(1, 73.4f, ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_DEFAULT,
+                 ANATIVEWINDOW_CHANGE_FRAME_RATE_ONLY_IF_SEAMLESS);
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    nsecs_t time = systemTime();
+    updateLayerSnapshotsAndLayerHistory(time);
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::ExplicitDefault, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(73.4_Hz, summarizeLayerHistory(time)[0].desiredRefreshRate);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, oneLayerExplicitExactVote) {
+    createLegacyAndFrontedEndLayer(1);
+    setFrameRate(1, 73.4f, ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE,
+                 ANATIVEWINDOW_CHANGE_FRAME_RATE_ONLY_IF_SEAMLESS);
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    nsecs_t time = systemTime();
+    updateLayerSnapshotsAndLayerHistory(time);
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::ExplicitExactOrMultiple,
+              summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(73.4_Hz, summarizeLayerHistory(time)[0].desiredRefreshRate);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, oneLayerExplicitCategory) {
+    createLegacyAndFrontedEndLayer(1);
+    setFrameRateCategory(1, ANATIVEWINDOW_FRAME_RATE_CATEGORY_HIGH);
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+
+    nsecs_t time = systemTime();
+    updateLayerSnapshotsAndLayerHistory(time);
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    // First LayerRequirement is the frame rate specification
+    EXPECT_EQ(LayerHistory::LayerVoteType::ExplicitCategory, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(0_Hz, summarizeLayerHistory(time)[0].desiredRefreshRate);
+    EXPECT_EQ(FrameRateCategory::High, summarizeLayerHistory(time)[0].frameRateCategory);
+}
+
+TEST_F(LayerHistoryIntegrationTest, multipleLayers) {
+    auto layer1 = createLegacyAndFrontedEndLayer(1);
+    auto layer2 = createLegacyAndFrontedEndLayer(2);
+    auto layer3 = createLegacyAndFrontedEndLayer(3);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(3u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+
+    LayerHistory::Summary summary;
+
+    // layer1 is active but infrequent.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
+        setBufferWithPresentTime(layer1, time);
+        time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(1u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summary[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+
+    // layer2 is frequent and has high refresh rate.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
+        setBufferWithPresentTime(layer2, time);
+        time += HI_FPS_PERIOD;
+        summary = summarizeLayerHistory(time);
+    }
+
+    // layer1 is still active but infrequent.
+    setBufferWithPresentTime(layer1, time);
+
+    ASSERT_EQ(2u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summary[0].vote);
+    ASSERT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[1].vote);
+    EXPECT_EQ(HI_FPS, summarizeLayerHistory(time)[1].desiredRefreshRate);
+
+    EXPECT_EQ(2u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+
+    // layer1 is no longer active.
+    // layer2 is frequent and has low refresh rate.
+    for (size_t i = 0; i < 2 * PRESENT_TIME_HISTORY_SIZE; i++) {
+        setBufferWithPresentTime(layer2, time);
+        time += LO_FPS_PERIOD;
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(1u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(LO_FPS, summary[0].desiredRefreshRate);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+
+    // layer2 still has low refresh rate.
+    // layer3 has high refresh rate but not enough history.
+    constexpr int RATIO = LO_FPS_PERIOD / HI_FPS_PERIOD;
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE - 1; i++) {
+        if (i % RATIO == 0) {
+            setBufferWithPresentTime(layer2, time);
+        }
+
+        setBufferWithPresentTime(layer3, time);
+        time += HI_FPS_PERIOD;
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(2u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(LO_FPS, summary[0].desiredRefreshRate);
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summary[1].vote);
+    EXPECT_EQ(2u, activeLayerCount());
+    EXPECT_EQ(2, frequentLayerCount(time));
+
+    // layer3 becomes recently active.
+    setBufferWithPresentTime(layer3, time);
+    summary = summarizeLayerHistory(time);
+    ASSERT_EQ(2u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(LO_FPS, summary[0].desiredRefreshRate);
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[1].vote);
+    EXPECT_EQ(HI_FPS, summary[1].desiredRefreshRate);
+    EXPECT_EQ(2u, activeLayerCount());
+    EXPECT_EQ(2, frequentLayerCount(time));
+
+    // layer1 expires.
+    destroyLayer(layer1);
+    updateLayerSnapshotsAndLayerHistory(time);
+
+    summary = summarizeLayerHistory(time);
+    ASSERT_EQ(2u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(LO_FPS, summary[0].desiredRefreshRate);
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[1].vote);
+    EXPECT_EQ(HI_FPS, summary[1].desiredRefreshRate);
+    EXPECT_EQ(2u, layerCount());
+    EXPECT_EQ(2u, activeLayerCount());
+    EXPECT_EQ(2, frequentLayerCount(time));
+
+    // layer2 still has low refresh rate.
+    // layer3 becomes inactive.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
+        setBufferWithPresentTime(layer2, time);
+        time += LO_FPS_PERIOD;
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(1u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(LO_FPS, summary[0].desiredRefreshRate);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+
+    // layer2 expires.
+    destroyLayer(layer2);
+    updateLayerSnapshotsAndLayerHistory(time);
+    summary = summarizeLayerHistory(time);
+    EXPECT_TRUE(summary.empty());
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+
+    // layer3 becomes active and has high refresh rate.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE + FREQUENT_LAYER_WINDOW_SIZE + 1; i++) {
+        setBufferWithPresentTime(layer3, time);
+        time += HI_FPS_PERIOD;
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(1u, summary.size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_EQ(HI_FPS, summary[0].desiredRefreshRate);
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+
+    // layer3 expires.
+    destroyLayer(layer3);
+    updateLayerSnapshotsAndLayerHistory(time);
+    summary = summarizeLayerHistory(time);
+    EXPECT_TRUE(summary.empty());
+    EXPECT_EQ(0u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, inactiveLayers) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+    nsecs_t time = systemTime();
+
+    // the very first updates makes the layer frequent
+    for (size_t i = 0; i < FREQUENT_LAYER_WINDOW_SIZE - 1; i++) {
+        setBufferWithPresentTime(layer, time);
+        time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+
+        EXPECT_EQ(1u, layerCount());
+        ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+        EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+        EXPECT_EQ(1u, activeLayerCount());
+        EXPECT_EQ(1, frequentLayerCount(time));
+    }
+
+    // the next update with the MAX_FREQUENT_LAYER_PERIOD_NS will get us to infrequent
+    time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+    setBufferWithPresentTime(layer, time);
+
+    EXPECT_EQ(1u, layerCount());
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+
+    // advance the time for the previous frame to be inactive
+    time += MAX_ACTIVE_LAYER_PERIOD_NS.count();
+
+    // Now even if we post a quick few frame we should stay infrequent
+    for (size_t i = 0; i < FREQUENT_LAYER_WINDOW_SIZE - 1; i++) {
+        setBufferWithPresentTime(layer, time);
+        time += HI_FPS_PERIOD;
+
+        EXPECT_EQ(1u, layerCount());
+        ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+        EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+        EXPECT_EQ(1u, activeLayerCount());
+        EXPECT_EQ(0, frequentLayerCount(time));
+    }
+
+    // More quick frames will get us to frequent again
+    setBufferWithPresentTime(layer, time);
+    time += HI_FPS_PERIOD;
+
+    EXPECT_EQ(1u, layerCount());
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, invisibleExplicitLayer) {
+    auto explicitVisiblelayer = createLegacyAndFrontedEndLayer(1);
+    auto explicitInvisiblelayer = createLegacyAndFrontedEndLayer(2);
+    hideLayer(2);
+    setFrameRate(1, 60.0f, ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE,
+                 ANATIVEWINDOW_CHANGE_FRAME_RATE_ONLY_IF_SEAMLESS);
+    setFrameRate(2, 90.0f, ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE,
+                 ANATIVEWINDOW_CHANGE_FRAME_RATE_ONLY_IF_SEAMLESS);
+    nsecs_t time = systemTime();
+
+    // Post a buffer to the layers to make them active
+    setBufferWithPresentTime(explicitVisiblelayer, time);
+    setBufferWithPresentTime(explicitInvisiblelayer, time);
+
+    EXPECT_EQ(2u, layerCount());
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::ExplicitExactOrMultiple,
+              summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(60_Hz, summarizeLayerHistory(time)[0].desiredRefreshRate);
+    EXPECT_EQ(2u, activeLayerCount());
+    EXPECT_EQ(2, frequentLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, infrequentAnimatingLayer) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // layer is active but infrequent.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
+        setBufferWithPresentTime(layer, time);
+        time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+    }
+
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // another update with the same cadence keep in infrequent
+    setBufferWithPresentTime(layer, time);
+    time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    mFlinger.mutableLayerSnapshotBuilder().getSnapshot(1)->changes |=
+            frontend::RequestedLayerState::Changes::Animation;
+    mFlinger.updateLayerHistory(time);
+    // an update as animation will immediately vote for Max
+    time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(1, animatingLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, frequentLayerBecomingInfrequentAndBack) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // Fill up the window with frequent updates
+    for (size_t i = 0; i < FREQUENT_LAYER_WINDOW_SIZE; i++) {
+        setBufferWithPresentTime(layer, time);
+        time += (60_Hz).getPeriodNsecs();
+
+        EXPECT_EQ(1u, layerCount());
+        ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+        EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+        EXPECT_EQ(1u, activeLayerCount());
+        EXPECT_EQ(1, frequentLayerCount(time));
+    }
+
+    // posting a buffer after long inactivity should retain the layer as active
+    time += std::chrono::nanoseconds(3s).count();
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(0, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(60_Hz, summarizeLayerHistory(time)[0].desiredRefreshRate);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // posting more infrequent buffer should make the layer infrequent
+    time += (MAX_FREQUENT_LAYER_PERIOD_NS + 1ms).count();
+    setBufferWithPresentTime(layer, time);
+    time += (MAX_FREQUENT_LAYER_PERIOD_NS + 1ms).count();
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(0, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // posting another buffer should keep the layer infrequent
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(0, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Min, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // posting more buffers would mean starting of an animation, so making the layer frequent
+    setBufferWithPresentTime(layer, time);
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(1, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // posting a buffer after long inactivity should retain the layer as active
+    time += std::chrono::nanoseconds(3s).count();
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(0, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // posting another buffer should keep the layer frequent
+    time += (60_Hz).getPeriodNsecs();
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(0, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, inconclusiveLayerBecomingFrequent) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // Fill up the window with frequent updates
+    for (size_t i = 0; i < FREQUENT_LAYER_WINDOW_SIZE; i++) {
+        setBufferWithPresentTime(layer, time);
+        time += (60_Hz).getPeriodNsecs();
+
+        EXPECT_EQ(1u, layerCount());
+        ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+        EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+        EXPECT_EQ(1u, activeLayerCount());
+        EXPECT_EQ(1, frequentLayerCount(time));
+    }
+
+    // posting infrequent buffers after long inactivity should make the layer
+    // inconclusive but frequent.
+    time += std::chrono::nanoseconds(3s).count();
+    setBufferWithPresentTime(layer, time);
+    time += (MAX_FREQUENT_LAYER_PERIOD_NS + 1ms).count();
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(0, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Heuristic, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // posting more buffers should make the layer frequent and switch the refresh rate to max
+    // by clearing the history
+    setBufferWithPresentTime(layer, time);
+    setBufferWithPresentTime(layer, time);
+    setBufferWithPresentTime(layer, time);
+    EXPECT_EQ(1, clearLayerHistoryCount(time));
+    ASSERT_EQ(1u, summarizeLayerHistory(time).size());
+    EXPECT_EQ(LayerHistory::LayerVoteType::Max, summarizeLayerHistory(time)[0].vote);
+    EXPECT_EQ(1u, activeLayerCount());
+    EXPECT_EQ(1, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+}
+
+TEST_F(LayerHistoryIntegrationTest, getFramerate) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+    EXPECT_EQ(0, animatingLayerCount(time));
+
+    // layer is active but infrequent.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
+        setBufferWithPresentTime(layer, time);
+        time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
+    }
+
+    float expectedFramerate = 1e9f / MAX_FREQUENT_LAYER_PERIOD_NS.count();
+    EXPECT_FLOAT_EQ(expectedFramerate, history().getLayerFramerate(time, layer->getSequence()));
+}
+
+TEST_F(LayerHistoryIntegrationTest, heuristicLayer60Hz) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+    for (float fps = 54.0f; fps < 65.0f; fps += 0.1f) {
+        recordFramesAndExpect(layer, time, Fps::fromValue(fps), 60_Hz, PRESENT_TIME_HISTORY_SIZE);
+    }
+}
+
+TEST_F(LayerHistoryIntegrationTest, heuristicLayer60_30Hz) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+    recordFramesAndExpect(layer, time, 60_Hz, 60_Hz, PRESENT_TIME_HISTORY_SIZE);
+
+    recordFramesAndExpect(layer, time, 60_Hz, 60_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 30_Hz, 60_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 30_Hz, 30_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 60_Hz, 30_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 60_Hz, 60_Hz, PRESENT_TIME_HISTORY_SIZE);
+}
+
+TEST_F(LayerHistoryIntegrationTest, heuristicLayerNotOscillating) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+
+    recordFramesAndExpect(layer, time, 27.1_Hz, 30_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 26.9_Hz, 30_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 26_Hz, 24_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 26.9_Hz, 24_Hz, PRESENT_TIME_HISTORY_SIZE);
+    recordFramesAndExpect(layer, time, 27.1_Hz, 30_Hz, PRESENT_TIME_HISTORY_SIZE);
+}
+
+TEST_F(LayerHistoryIntegrationTest, smallDirtyLayer) {
+    auto layer = createLegacyAndFrontedEndLayer(1);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(1u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+
+    LayerHistory::Summary summary;
+
+    // layer is active but infrequent.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
+        auto props = layer->getLayerProps();
+        if (i % 3 == 0) {
+            props.isSmallDirty = false;
+        } else {
+            props.isSmallDirty = true;
+        }
+
+        setBufferWithPresentTime(layer, time);
+        time += HI_FPS_PERIOD;
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(1u, summary.size());
+    ASSERT_EQ(LayerHistory::LayerVoteType::Heuristic, summary[0].vote);
+    EXPECT_GE(HI_FPS, summary[0].desiredRefreshRate);
+}
+
+TEST_F(LayerHistoryIntegrationTest, DISABLED_smallDirtyInMultiLayer) {
+    auto uiLayer = createLegacyAndFrontedEndLayer(1);
+    auto videoLayer = createLegacyAndFrontedEndLayer(2);
+    setFrameRate(2, 30.0f, ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_DEFAULT,
+                 ANATIVEWINDOW_CHANGE_FRAME_RATE_ONLY_IF_SEAMLESS);
+
+    nsecs_t time = systemTime();
+
+    EXPECT_EQ(2u, layerCount());
+    EXPECT_EQ(0u, activeLayerCount());
+    EXPECT_EQ(0, frequentLayerCount(time));
+
+    LayerHistory::Summary summary;
+
+    // uiLayer is updating small dirty.
+    for (size_t i = 0; i < PRESENT_TIME_HISTORY_SIZE + FREQUENT_LAYER_WINDOW_SIZE + 1; i++) {
+        auto props = uiLayer->getLayerProps();
+        props.isSmallDirty = true;
+        setBuffer(1);
+        uiLayer->setDesiredPresentTime(0, false /*autotimestamp*/);
+        updateLayerSnapshotsAndLayerHistory(time);
+        setBufferWithPresentTime(videoLayer, time);
+        summary = summarizeLayerHistory(time);
+    }
+
+    ASSERT_EQ(1u, summary.size());
+    ASSERT_EQ(LayerHistory::LayerVoteType::ExplicitDefault, summary[0].vote);
+    ASSERT_EQ(30_Hz, summary[0].desiredRefreshRate);
+}
+
+class LayerHistoryIntegrationTestParameterized
+      : public LayerHistoryIntegrationTest,
+        public testing::WithParamInterface<std::chrono::nanoseconds> {};
+
+TEST_P(LayerHistoryIntegrationTestParameterized, HeuristicLayerWithInfrequentLayer) {
+    std::chrono::nanoseconds infrequentUpdateDelta = GetParam();
+    auto heuristicLayer = createLegacyAndFrontedEndLayer(1);
+    auto infrequentLayer = createLegacyAndFrontedEndLayer(2);
+
+    const nsecs_t startTime = systemTime();
+
+    const std::chrono::nanoseconds heuristicUpdateDelta = 41'666'667ns;
+    setBufferWithPresentTime(heuristicLayer, startTime);
+    setBufferWithPresentTime(infrequentLayer, startTime);
+
+    nsecs_t time = startTime;
+    nsecs_t lastInfrequentUpdate = startTime;
+    const size_t totalInfrequentLayerUpdates = FREQUENT_LAYER_WINDOW_SIZE * 5;
+    size_t infrequentLayerUpdates = 0;
+    while (infrequentLayerUpdates <= totalInfrequentLayerUpdates) {
+        time += heuristicUpdateDelta.count();
+        setBufferWithPresentTime(heuristicLayer, time);
+
+        if (time - lastInfrequentUpdate >= infrequentUpdateDelta.count()) {
+            ALOGI("submitting infrequent frame [%zu/%zu]", infrequentLayerUpdates,
+                  totalInfrequentLayerUpdates);
+            lastInfrequentUpdate = time;
+            setBufferWithPresentTime(infrequentLayer, time);
+            infrequentLayerUpdates++;
+        }
+
+        if (time - startTime > PRESENT_TIME_HISTORY_DURATION.count()) {
+            ASSERT_NE(0u, summarizeLayerHistory(time).size());
+            ASSERT_GE(2u, summarizeLayerHistory(time).size());
+
+            bool max = false;
+            bool min = false;
+            Fps heuristic;
+            for (const auto& layer : summarizeLayerHistory(time)) {
+                if (layer.vote == LayerHistory::LayerVoteType::Heuristic) {
+                    heuristic = layer.desiredRefreshRate;
+                } else if (layer.vote == LayerHistory::LayerVoteType::Max) {
+                    max = true;
+                } else if (layer.vote == LayerHistory::LayerVoteType::Min) {
+                    min = true;
+                }
+            }
+
+            if (infrequentLayerUpdates > FREQUENT_LAYER_WINDOW_SIZE) {
+                EXPECT_EQ(24_Hz, heuristic);
+                EXPECT_FALSE(max);
+                if (summarizeLayerHistory(time).size() == 2) {
+                    EXPECT_TRUE(min);
+                }
+            }
+        }
+    }
+}
+
+INSTANTIATE_TEST_CASE_P(LeapYearTests, LayerHistoryIntegrationTestParameterized,
+                        ::testing::Values(1s, 2s, 3s, 4s, 5s));
+
+} // namespace
+} // namespace android::scheduler
diff --git a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
index 549a362..33c1d86 100644
--- a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
@@ -45,6 +45,8 @@
 
 using android::mock::createDisplayMode;
 
+// WARNING: LEGACY TESTS FOR LEGACY FRONT END
+// Update LayerHistoryIntegrationTest instead
 class LayerHistoryTest : public testing::Test {
 protected:
     static constexpr auto PRESENT_TIME_HISTORY_SIZE = LayerInfo::HISTORY_SIZE;
diff --git a/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp b/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp
index 69316bf..e856816 100644
--- a/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerSnapshotTest.cpp
@@ -50,27 +50,12 @@
     --gtest_filter="LayerSnapshotTest.*" --gtest_brief=1
 */
 
-class LayerSnapshotTest : public LayerHierarchyTestBase {
+class LayerSnapshotTest : public LayerSnapshotTestBase {
 protected:
-    LayerSnapshotTest() : LayerHierarchyTestBase() {
+    LayerSnapshotTest() : LayerSnapshotTestBase() {
         UPDATE_AND_VERIFY(mSnapshotBuilder, STARTING_ZORDER);
     }
 
-    void createRootLayer(uint32_t id) override {
-        LayerHierarchyTestBase::createRootLayer(id);
-        setColor(id);
-    }
-
-    void createLayer(uint32_t id, uint32_t parentId) override {
-        LayerHierarchyTestBase::createLayer(id, parentId);
-        setColor(parentId);
-    }
-
-    void mirrorLayer(uint32_t id, uint32_t parent, uint32_t layerToMirror) override {
-        LayerHierarchyTestBase::mirrorLayer(id, parent, layerToMirror);
-        setColor(id);
-    }
-
     void update(LayerSnapshotBuilder& actualBuilder, LayerSnapshotBuilder::Args& args) {
         if (mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy)) {
             mHierarchyBuilder.update(mLifecycleManager.getLayers(),
@@ -111,11 +96,7 @@
     LayerSnapshot* getSnapshot(const LayerHierarchy::TraversalPath path) {
         return mSnapshotBuilder.getSnapshot(path);
     }
-
-    LayerHierarchyBuilder mHierarchyBuilder{{}};
     LayerSnapshotBuilder mSnapshotBuilder;
-    DisplayInfos mFrontEndDisplayInfos;
-    renderengine::ShadowSettings globalShadowSettings;
     static const std::vector<uint32_t> STARTING_ZORDER;
 };
 const std::vector<uint32_t> LayerSnapshotTest::STARTING_ZORDER = {1,   11,   111, 12, 121,
diff --git a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
index 173f941..a6f23ed 100644
--- a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
@@ -192,7 +192,7 @@
 
     // recordLayerHistory should be a noop
     ASSERT_EQ(0u, mScheduler->getNumActiveLayers());
-    mScheduler->recordLayerHistory(layer->getSequence(), layer->getLayerProps(), 0,
+    mScheduler->recordLayerHistory(layer->getSequence(), layer->getLayerProps(), 0, 0,
                                    LayerHistory::LayerUpdateType::Buffer);
     ASSERT_EQ(0u, mScheduler->getNumActiveLayers());
 
@@ -218,7 +218,7 @@
                                                                       kDisplay1Mode60->getId()));
 
     ASSERT_EQ(0u, mScheduler->getNumActiveLayers());
-    mScheduler->recordLayerHistory(layer->getSequence(), layer->getLayerProps(), 0,
+    mScheduler->recordLayerHistory(layer->getSequence(), layer->getLayerProps(), 0, 0,
                                    LayerHistory::LayerUpdateType::Buffer);
     ASSERT_EQ(1u, mScheduler->getNumActiveLayers());
 }
@@ -273,7 +273,7 @@
     const sp<MockLayer> layer = sp<MockLayer>::make(mFlinger.flinger());
     EXPECT_CALL(*layer, isVisible()).WillOnce(Return(true));
 
-    mScheduler->recordLayerHistory(layer->getSequence(), layer->getLayerProps(), 0,
+    mScheduler->recordLayerHistory(layer->getSequence(), layer->getLayerProps(), 0, systemTime(),
                                    LayerHistory::LayerUpdateType::Buffer);
 
     constexpr hal::PowerMode kPowerModeOn = hal::PowerMode::ON;
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index dd998ba..b54392e 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -604,6 +604,13 @@
         return static_cast<mock::FrameTracer*>(mFlinger->mFrameTracer.get());
     }
 
+    void injectLegacyLayer(sp<Layer> layer) {
+        mFlinger->mLegacyLayers[static_cast<uint32_t>(layer->sequence)] = layer;
+    };
+
+    void releaseLegacyLayer(uint32_t sequence) { mFlinger->mLegacyLayers.erase(sequence); };
+
+    auto updateLayerHistory(nsecs_t now) { return mFlinger->updateLayerHistory(now); };
     /* ------------------------------------------------------------------------
      * Read-write access to private data to set up preconditions and assert
      * post-conditions.
@@ -644,8 +651,8 @@
     }
 
     auto& mutableMinAcquiredBuffers() { return SurfaceFlinger::minAcquiredBuffers; }
-
     auto& mutableLayersPendingRemoval() { return mFlinger->mLayersPendingRemoval; }
+    auto& mutableLayerSnapshotBuilder() { return mFlinger->mLayerSnapshotBuilder; };
 
     auto fromHandle(const sp<IBinder>& handle) { return LayerHandle::getLayer(handle); }