diff --git a/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp b/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp
index fa31643..1379665 100644
--- a/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp
+++ b/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp
@@ -80,7 +80,8 @@
                             std::unique_ptr<EventThread>(mEventThread),
                             std::unique_ptr<EventThread>(mSFEventThread),
                             TestableSurfaceFlinger::DefaultDisplayMode{displayId},
-                            TestableSurfaceFlinger::SchedulerCallbackImpl::kMock);
+                            TestableSurfaceFlinger::SchedulerCallbackImpl::kMock,
+                            TestableSurfaceFlinger::VsyncTrackerCallbackImpl::kMock);
 }
 
 void DisplayTransactionTest::injectMockComposer(int virtualDisplayCount) {
diff --git a/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp b/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp
index 2f6058f..190c0e8 100644
--- a/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerHistoryIntegrationTest.cpp
@@ -165,8 +165,10 @@
                                                   DisplayModeId(0));
 
     mock::SchedulerCallback mSchedulerCallback;
+    mock::VsyncTrackerCallback mVsyncTrackerCallback;
 
-    TestableScheduler* mScheduler = new TestableScheduler(mSelector, mSchedulerCallback);
+    TestableScheduler* mScheduler =
+            new TestableScheduler(mSelector, mSchedulerCallback, mVsyncTrackerCallback);
 
     TestableSurfaceFlinger mFlinger;
 };
diff --git a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
index e8831ab..5328fa3 100644
--- a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
@@ -144,7 +144,9 @@
 
     mock::SchedulerCallback mSchedulerCallback;
 
-    TestableScheduler* mScheduler = new TestableScheduler(mSelector, mSchedulerCallback);
+    mock::VsyncTrackerCallback mVsyncTrackerCallback;
+    TestableScheduler* mScheduler =
+            new TestableScheduler(mSelector, mSchedulerCallback, mVsyncTrackerCallback);
 
     TestableSurfaceFlinger mFlinger;
 };
diff --git a/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp b/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
index 11072bc..830dcce 100644
--- a/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
@@ -61,7 +61,9 @@
                                                                               HI_FPS)),
                                                   DisplayModeId(0));
     mock::SchedulerCallback mSchedulerCallback;
-    TestableScheduler* mScheduler = new TestableScheduler(mSelector, mSchedulerCallback);
+    mock::VsyncTrackerCallback mVsyncTrackerCallback;
+    TestableScheduler* mScheduler =
+            new TestableScheduler(mSelector, mSchedulerCallback, mVsyncTrackerCallback);
     TestableSurfaceFlinger mFlinger;
 };
 
diff --git a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
index 87fae2c..b5eb777 100644
--- a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
@@ -89,7 +89,9 @@
                                                   kDisplay1Mode60->getId());
 
     mock::SchedulerCallback mSchedulerCallback;
-    TestableScheduler* mScheduler = new TestableScheduler{mSelector, mSchedulerCallback};
+    mock::VsyncTrackerCallback mVsyncTrackerCallback;
+    TestableScheduler* mScheduler =
+            new TestableScheduler{mSelector, mSchedulerCallback, mVsyncTrackerCallback};
     surfaceflinger::frontend::LayerHierarchyBuilder mLayerHierarchyBuilder{{}};
 
     ConnectionHandle mConnectionHandle;
diff --git a/services/surfaceflinger/tests/unittests/TestableScheduler.h b/services/surfaceflinger/tests/unittests/TestableScheduler.h
index 3d1c900..8b6f0f1 100644
--- a/services/surfaceflinger/tests/unittests/TestableScheduler.h
+++ b/services/surfaceflinger/tests/unittests/TestableScheduler.h
@@ -36,18 +36,21 @@
 
 class TestableScheduler : public Scheduler, private ICompositor {
 public:
-    TestableScheduler(RefreshRateSelectorPtr selectorPtr, ISchedulerCallback& callback)
+    TestableScheduler(RefreshRateSelectorPtr selectorPtr, ISchedulerCallback& callback,
+                      IVsyncTrackerCallback& vsyncTrackerCallback)
           : TestableScheduler(std::make_unique<mock::VsyncController>(),
                               std::make_shared<mock::VSyncTracker>(), std::move(selectorPtr),
-                              sp<VsyncModulator>::make(VsyncConfigSet{}), callback) {}
+                              sp<VsyncModulator>::make(VsyncConfigSet{}), callback,
+                              vsyncTrackerCallback) {}
 
     TestableScheduler(std::unique_ptr<VsyncController> controller,
                       std::shared_ptr<VSyncTracker> tracker, RefreshRateSelectorPtr selectorPtr,
-                      sp<VsyncModulator> modulatorPtr, ISchedulerCallback& callback)
-          : Scheduler(*this, callback,
+                      sp<VsyncModulator> modulatorPtr, ISchedulerCallback& schedulerCallback,
+                      IVsyncTrackerCallback& vsyncTrackerCallback)
+          : Scheduler(*this, schedulerCallback,
                       (FeatureFlags)Feature::kContentDetection |
                               Feature::kSmallDirtyContentDetection,
-                      std::move(modulatorPtr)) {
+                      std::move(modulatorPtr), vsyncTrackerCallback) {
         const auto displayId = selectorPtr->getActiveMode().modePtr->getPhysicalDisplayId();
         registerDisplay(displayId, std::move(selectorPtr), std::move(controller),
                         std::move(tracker));
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index 03af56c..d0b2199 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -53,6 +53,7 @@
 #include "mock/MockFrameTimeline.h"
 #include "mock/MockFrameTracer.h"
 #include "mock/MockSchedulerCallback.h"
+#include "mock/MockVsyncTrackerCallback.h"
 #include "mock/system/window/MockNativeWindow.h"
 
 #include "Scheduler/VSyncTracker.h"
@@ -204,6 +205,8 @@
 
     enum class SchedulerCallbackImpl { kNoOp, kMock };
 
+    enum class VsyncTrackerCallbackImpl { kNoOp, kMock };
+
     struct DefaultDisplayMode {
         // The ID of the injected RefreshRateSelector and its default display mode.
         PhysicalDisplayId displayId;
@@ -213,13 +216,14 @@
 
     using DisplayModesVariant = std::variant<DefaultDisplayMode, RefreshRateSelectorPtr>;
 
-    void setupScheduler(std::unique_ptr<scheduler::VsyncController> vsyncController,
-                        std::shared_ptr<scheduler::VSyncTracker> vsyncTracker,
-                        std::unique_ptr<EventThread> appEventThread,
-                        std::unique_ptr<EventThread> sfEventThread,
-                        DisplayModesVariant modesVariant,
-                        SchedulerCallbackImpl callbackImpl = SchedulerCallbackImpl::kNoOp,
-                        bool useNiceMock = false) {
+    void setupScheduler(
+            std::unique_ptr<scheduler::VsyncController> vsyncController,
+            std::shared_ptr<scheduler::VSyncTracker> vsyncTracker,
+            std::unique_ptr<EventThread> appEventThread, std::unique_ptr<EventThread> sfEventThread,
+            DisplayModesVariant modesVariant,
+            SchedulerCallbackImpl callbackImpl = SchedulerCallbackImpl::kNoOp,
+            VsyncTrackerCallbackImpl vsyncTrackerCallbackImpl = VsyncTrackerCallbackImpl::kNoOp,
+            bool useNiceMock = false) {
         RefreshRateSelectorPtr selectorPtr = ftl::match(
                 modesVariant,
                 [](DefaultDisplayMode arg) {
@@ -239,10 +243,16 @@
 
         mTokenManager = std::make_unique<frametimeline::impl::TokenManager>();
 
-        using Callback = scheduler::ISchedulerCallback;
-        Callback& callback = callbackImpl == SchedulerCallbackImpl::kNoOp
-                ? static_cast<Callback&>(mNoOpSchedulerCallback)
-                : static_cast<Callback&>(mSchedulerCallback);
+        using ISchedulerCallback = scheduler::ISchedulerCallback;
+        ISchedulerCallback& schedulerCallback = callbackImpl == SchedulerCallbackImpl::kNoOp
+                ? static_cast<ISchedulerCallback&>(mNoOpSchedulerCallback)
+                : static_cast<ISchedulerCallback&>(mSchedulerCallback);
+
+        using VsyncTrackerCallback = scheduler::IVsyncTrackerCallback;
+        VsyncTrackerCallback& vsyncTrackerCallback =
+                vsyncTrackerCallbackImpl == VsyncTrackerCallbackImpl::kNoOp
+                ? static_cast<VsyncTrackerCallback&>(mNoOpVsyncTrackerCallback)
+                : static_cast<VsyncTrackerCallback&>(mVsyncTrackerCallback);
 
         auto modulatorPtr = sp<scheduler::VsyncModulator>::make(
                 mFlinger->mVsyncConfiguration->getCurrentConfigs());
@@ -253,12 +263,14 @@
                                                                         std::move(vsyncTracker),
                                                                         std::move(selectorPtr),
                                                                         std::move(modulatorPtr),
-                                                                        callback);
+                                                                        schedulerCallback,
+                                                                        vsyncTrackerCallback);
         } else {
             mScheduler = new scheduler::TestableScheduler(std::move(vsyncController),
                                                           std::move(vsyncTracker),
                                                           std::move(selectorPtr),
-                                                          std::move(modulatorPtr), callback);
+                                                          std::move(modulatorPtr),
+                                                          schedulerCallback, vsyncTrackerCallback);
         }
 
         mScheduler->initVsync(mScheduler->getVsyncSchedule()->getDispatch(), *mTokenManager, 0ms);
@@ -297,7 +309,8 @@
         EXPECT_CALL(*vsyncTracker, nextAnticipatedVSyncTimeFrom(_)).WillRepeatedly(Return(0));
         setupScheduler(std::move(vsyncController), std::move(vsyncTracker), std::move(eventThread),
                        std::move(sfEventThread), DefaultDisplayMode{options.displayId},
-                       SchedulerCallbackImpl::kNoOp, options.useNiceMock);
+                       SchedulerCallbackImpl::kNoOp, VsyncTrackerCallbackImpl::kNoOp,
+                       options.useNiceMock);
     }
 
     void resetScheduler(scheduler::Scheduler* scheduler) { mFlinger->mScheduler.reset(scheduler); }
@@ -1071,6 +1084,8 @@
     sp<SurfaceFlinger> mFlinger;
     scheduler::mock::SchedulerCallback mSchedulerCallback;
     scheduler::mock::NoOpSchedulerCallback mNoOpSchedulerCallback;
+    scheduler::mock::VsyncTrackerCallback mVsyncTrackerCallback;
+    scheduler::mock::NoOpVsyncTrackerCallback mNoOpVsyncTrackerCallback;
     std::unique_ptr<frametimeline::impl::TokenManager> mTokenManager;
     scheduler::TestableScheduler* mScheduler = nullptr;
     Hwc2::mock::PowerAdvisor mPowerAdvisor;
diff --git a/services/surfaceflinger/tests/unittests/VSyncDispatchRealtimeTest.cpp b/services/surfaceflinger/tests/unittests/VSyncDispatchRealtimeTest.cpp
index 41866a1..4be07a1 100644
--- a/services/surfaceflinger/tests/unittests/VSyncDispatchRealtimeTest.cpp
+++ b/services/surfaceflinger/tests/unittests/VSyncDispatchRealtimeTest.cpp
@@ -54,7 +54,7 @@
     void resetModel() final {}
     bool needsMoreSamples() const final { return false; }
     bool isVSyncInPhase(nsecs_t, Fps) const final { return false; }
-    void setRenderRate(Fps) final {}
+    void setDisplayModeData(const DisplayModeData&) final {}
     void dump(std::string&) const final {}
 
 private:
@@ -92,7 +92,7 @@
     void resetModel() final {}
     bool needsMoreSamples() const final { return false; }
     bool isVSyncInPhase(nsecs_t, Fps) const final { return false; }
-    void setRenderRate(Fps) final {}
+    void setDisplayModeData(const DisplayModeData&) final {}
     void dump(std::string&) const final {}
 
 private:
diff --git a/services/surfaceflinger/tests/unittests/VSyncDispatchTimerQueueTest.cpp b/services/surfaceflinger/tests/unittests/VSyncDispatchTimerQueueTest.cpp
index 1dc5498..fbbb4a2 100644
--- a/services/surfaceflinger/tests/unittests/VSyncDispatchTimerQueueTest.cpp
+++ b/services/surfaceflinger/tests/unittests/VSyncDispatchTimerQueueTest.cpp
@@ -59,7 +59,7 @@
     MOCK_METHOD0(resetModel, void());
     MOCK_CONST_METHOD0(needsMoreSamples, bool());
     MOCK_CONST_METHOD2(isVSyncInPhase, bool(nsecs_t, Fps));
-    MOCK_METHOD(void, setRenderRate, (Fps), (override));
+    MOCK_METHOD(void, setDisplayModeData, (const DisplayModeData&), (override));
     MOCK_CONST_METHOD1(dump, void(std::string&));
 
     nsecs_t nextVSyncTime(nsecs_t timePoint) const {
diff --git a/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp b/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
index 43d683d..30a2855 100644
--- a/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
+++ b/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
@@ -23,7 +23,9 @@
 #define LOG_TAG "LibSurfaceFlingerUnittests"
 #define LOG_NDEBUG 0
 
+#include "FlagUtils.h"
 #include "Scheduler/VSyncPredictor.h"
+#include "mock/MockVsyncTrackerCallback.h"
 
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
@@ -31,8 +33,11 @@
 #include <chrono>
 #include <utility>
 
+#include <com_android_graphics_surfaceflinger_flags.h>
+
 using namespace testing;
 using namespace std::literals;
+using namespace com::android::graphics::surfaceflinger;
 
 namespace android::scheduler {
 
@@ -52,13 +57,18 @@
 struct VSyncPredictorTest : testing::Test {
     nsecs_t mNow = 0;
     nsecs_t mPeriod = 1000;
+    scheduler::mock::VsyncTrackerCallback mVsyncTrackerCallback;
     static constexpr size_t kHistorySize = 10;
     static constexpr size_t kMinimumSamplesForPrediction = 6;
     static constexpr size_t kOutlierTolerancePercent = 25;
     static constexpr nsecs_t mMaxRoundingError = 100;
 
-    VSyncPredictor tracker{DEFAULT_DISPLAY_ID, mPeriod, kHistorySize, kMinimumSamplesForPrediction,
-                           kOutlierTolerancePercent};
+    VSyncPredictor tracker{DEFAULT_DISPLAY_ID,
+                           mPeriod,
+                           kHistorySize,
+                           kMinimumSamplesForPrediction,
+                           kOutlierTolerancePercent,
+                           mVsyncTrackerCallback};
 };
 
 TEST_F(VSyncPredictorTest, reportsAnticipatedPeriod) {
@@ -378,8 +388,12 @@
 
 // See b/151146131
 TEST_F(VSyncPredictorTest, hasEnoughPrecision) {
-    VSyncPredictor tracker{DEFAULT_DISPLAY_ID, mPeriod, 20, kMinimumSamplesForPrediction,
-                           kOutlierTolerancePercent};
+    VSyncPredictor tracker{DEFAULT_DISPLAY_ID,
+                           mPeriod,
+                           20,
+                           kMinimumSamplesForPrediction,
+                           kOutlierTolerancePercent,
+                           mVsyncTrackerCallback};
     std::vector<nsecs_t> const simulatedVsyncs{840873348817, 840890049444, 840906762675,
                                                840923581635, 840940161584, 840956868096,
                                                840973702473, 840990256277, 841007116851,
@@ -566,7 +580,7 @@
         tracker.addVsyncTimestamp(mNow);
     }
 
-    tracker.setRenderRate(Fps::fromPeriodNsecs(3 * mPeriod));
+    tracker.setDisplayModeData({.renderRate = Fps::fromPeriodNsecs(3 * mPeriod)});
 
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow), Eq(mNow + mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 100), Eq(mNow + mPeriod));
@@ -588,12 +602,12 @@
 
     const auto refreshRate = Fps::fromPeriodNsecs(mPeriod);
 
-    tracker.setRenderRate(refreshRate / 4);
+    tracker.setDisplayModeData({.renderRate = refreshRate / 4});
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow), Eq(mNow + 3 * mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 3 * mPeriod), Eq(mNow + 7 * mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 7 * mPeriod), Eq(mNow + 11 * mPeriod));
 
-    tracker.setRenderRate(refreshRate / 2);
+    tracker.setDisplayModeData({.renderRate = refreshRate / 2});
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow), Eq(mNow + 1 * mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 1 * mPeriod), Eq(mNow + 3 * mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 3 * mPeriod), Eq(mNow + 5 * mPeriod));
@@ -601,7 +615,7 @@
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 7 * mPeriod), Eq(mNow + 9 * mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 9 * mPeriod), Eq(mNow + 11 * mPeriod));
 
-    tracker.setRenderRate(refreshRate / 6);
+    tracker.setDisplayModeData({.renderRate = refreshRate / 6});
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow), Eq(mNow + 1 * mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 1 * mPeriod), Eq(mNow + 7 * mPeriod));
 }
@@ -615,7 +629,7 @@
         tracker.addVsyncTimestamp(mNow);
     }
 
-    tracker.setRenderRate(Fps::fromPeriodNsecs(3.5f * mPeriod));
+    tracker.setDisplayModeData({.renderRate = Fps::fromPeriodNsecs(3.5f * mPeriod)});
 
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow), Eq(mNow + mPeriod));
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 100), Eq(mNow + mPeriod));
@@ -626,6 +640,39 @@
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 5100), Eq(mNow + 6 * mPeriod));
 }
 
+TEST_F(VSyncPredictorTest, vsyncTrackerCallback) {
+    SET_FLAG_FOR_TEST(flags::vrr_config, true);
+    const auto refreshRate = Fps::fromPeriodNsecs(mPeriod);
+    DisplayModeData displayModeData =
+            DisplayModeData{.renderRate = refreshRate,
+                            .notifyExpectedPresentTimeoutOpt = Period::fromNs(30)};
+    tracker.setDisplayModeData(displayModeData);
+    auto last = mNow;
+    for (auto i = 0u; i < kMinimumSamplesForPrediction; i++) {
+        EXPECT_CALL(mVsyncTrackerCallback,
+                    onVsyncGenerated(DEFAULT_DISPLAY_ID, TimePoint::fromNs(last + mPeriod),
+                                     displayModeData, Period::fromNs(mPeriod)))
+                .Times(1);
+        EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow), Eq(last + mPeriod));
+        mNow += mPeriod;
+        last = mNow;
+        tracker.addVsyncTimestamp(mNow);
+    }
+
+    displayModeData = DisplayModeData{.renderRate = refreshRate / 2,
+                                      .notifyExpectedPresentTimeoutOpt = Period::fromNs(30)};
+    tracker.setDisplayModeData(displayModeData);
+    {
+        // out of render rate phase
+        EXPECT_CALL(mVsyncTrackerCallback,
+                    onVsyncGenerated(DEFAULT_DISPLAY_ID, TimePoint::fromNs(mNow + 3 * mPeriod),
+                                     displayModeData, Period::fromNs(mPeriod)))
+                .Times(1);
+        EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 1 * mPeriod),
+                    Eq(mNow + 3 * mPeriod));
+    }
+}
+
 } // namespace android::scheduler
 
 // TODO(b/129481165): remove the #pragma below and fix conversion issues
diff --git a/services/surfaceflinger/tests/unittests/VSyncReactorTest.cpp b/services/surfaceflinger/tests/unittests/VSyncReactorTest.cpp
index 122192b..aca3ccc 100644
--- a/services/surfaceflinger/tests/unittests/VSyncReactorTest.cpp
+++ b/services/surfaceflinger/tests/unittests/VSyncReactorTest.cpp
@@ -50,7 +50,7 @@
     MOCK_METHOD0(resetModel, void());
     MOCK_CONST_METHOD0(needsMoreSamples, bool());
     MOCK_CONST_METHOD2(isVSyncInPhase, bool(nsecs_t, Fps));
-    MOCK_METHOD(void, setRenderRate, (Fps), (override));
+    MOCK_METHOD(void, setDisplayModeData, (const DisplayModeData&), (override));
     MOCK_CONST_METHOD1(dump, void(std::string&));
 };
 
diff --git a/services/surfaceflinger/tests/unittests/mock/MockVSyncTracker.h b/services/surfaceflinger/tests/unittests/mock/MockVSyncTracker.h
index dcf25e1..31eb86e 100644
--- a/services/surfaceflinger/tests/unittests/mock/MockVSyncTracker.h
+++ b/services/surfaceflinger/tests/unittests/mock/MockVSyncTracker.h
@@ -34,7 +34,7 @@
     MOCK_METHOD0(resetModel, void());
     MOCK_CONST_METHOD0(needsMoreSamples, bool());
     MOCK_CONST_METHOD2(isVSyncInPhase, bool(nsecs_t, Fps));
-    MOCK_METHOD(void, setRenderRate, (Fps), (override));
+    MOCK_METHOD(void, setDisplayModeData, (const scheduler::DisplayModeData&), (override));
     MOCK_CONST_METHOD1(dump, void(std::string&));
 };
 
diff --git a/services/surfaceflinger/tests/unittests/mock/MockVsyncTrackerCallback.h b/services/surfaceflinger/tests/unittests/mock/MockVsyncTrackerCallback.h
new file mode 100644
index 0000000..b8e24e0
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/mock/MockVsyncTrackerCallback.h
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+
+#include "Scheduler/VSyncTracker.h"
+
+namespace android::scheduler::mock {
+
+struct VsyncTrackerCallback final : IVsyncTrackerCallback {
+    MOCK_METHOD(void, onVsyncGenerated,
+                (PhysicalDisplayId, TimePoint, const scheduler::DisplayModeData&, Period),
+                (override));
+};
+
+struct NoOpVsyncTrackerCallback final : IVsyncTrackerCallback {
+    void onVsyncGenerated(PhysicalDisplayId, TimePoint, const scheduler::DisplayModeData&,
+                          Period) override{};
+};
+} // namespace android::scheduler::mock