SF: Introduce VsyncTimeline to VsyncPredictor

Add the concept of timeline freezing when switching render rate.
This allow us to change render rates in sync with the app and remain
jank free across render rate changes.

Bug: 326599221
Test: Run TouchLatency, change render rate and examine Perfetto trace

Change-Id: Ibc8026434c0c1d50138299da3cb110b317604e92
diff --git a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
index 10e2220..049b092 100644
--- a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
@@ -25,6 +25,7 @@
 #include "Scheduler/EventThread.h"
 #include "Scheduler/RefreshRateSelector.h"
 #include "Scheduler/VSyncPredictor.h"
+#include "Scheduler/VSyncReactor.h"
 #include "TestableScheduler.h"
 #include "TestableSurfaceFlinger.h"
 #include "mock/DisplayHardware/MockDisplayMode.h"
@@ -563,7 +564,8 @@
                                  hal::VrrConfig{.minFrameIntervalNs = static_cast<int32_t>(
                                                         frameRate.getPeriodNsecs())}));
     std::shared_ptr<VSyncPredictor> vrrTracker =
-            std::make_shared<VSyncPredictor>(kMode, kHistorySize, kMinimumSamplesForPrediction,
+            std::make_shared<VSyncPredictor>(std::make_unique<SystemClock>(), kMode, kHistorySize,
+                                             kMinimumSamplesForPrediction,
                                              kOutlierTolerancePercent);
     std::shared_ptr<RefreshRateSelector> vrrSelectorPtr =
             std::make_shared<RefreshRateSelector>(makeModes(kMode), kMode->getId());
@@ -578,6 +580,8 @@
     vrrSelectorPtr->setActiveMode(kMode->getId(), frameRate);
     scheduler.setRenderRate(kMode->getPhysicalDisplayId(), frameRate);
     vrrTracker->addVsyncTimestamp(0);
+    // Set 1000 as vsync seq #0
+    vrrTracker->nextAnticipatedVSyncTimeFrom(700);
 
     EXPECT_EQ(Fps::fromPeriodNsecs(1000),
               scheduler.getNextFrameInterval(kMode->getPhysicalDisplayId(),
@@ -587,7 +591,7 @@
                                              TimePoint::fromNs(2000)));
 
     // Not crossing the min frame period
-    EXPECT_EQ(Fps::fromPeriodNsecs(1500),
+    EXPECT_EQ(Fps::fromPeriodNsecs(1000),
               scheduler.getNextFrameInterval(kMode->getPhysicalDisplayId(),
                                              TimePoint::fromNs(2500)));
     // Change render rate
@@ -595,6 +599,9 @@
     vrrSelectorPtr->setActiveMode(kMode->getId(), frameRate);
     scheduler.setRenderRate(kMode->getPhysicalDisplayId(), frameRate);
 
+    // Set 2000 as vsync seq #0
+    vrrTracker->nextAnticipatedVSyncTimeFrom(1700);
+
     EXPECT_EQ(Fps::fromPeriodNsecs(2000),
               scheduler.getNextFrameInterval(kMode->getPhysicalDisplayId(),
                                              TimePoint::fromNs(2000)));