SurfaceFlinger: use vsyncPeriod from HWC

Composer 2.4 onVsync callback provides a vsyncPeriod. Use that period
in VsyncReactor to know when a vsync transition is done.

Test: adb shell /data/nativetest64/libsurfaceflinger_unittest/libsurfaceflinger_unittest
Bug: 140201379
Change-Id: Ia255e3b1d722fd1a3e571ec2aeceb1e8569d44d4
diff --git a/services/surfaceflinger/Scheduler/DispSync.h b/services/surfaceflinger/Scheduler/DispSync.h
index c6aadbb..2d9afc9 100644
--- a/services/surfaceflinger/Scheduler/DispSync.h
+++ b/services/surfaceflinger/Scheduler/DispSync.h
@@ -49,7 +49,8 @@
     virtual void reset() = 0;
     virtual bool addPresentFence(const std::shared_ptr<FenceTime>&) = 0;
     virtual void beginResync() = 0;
-    virtual bool addResyncSample(nsecs_t timestamp, bool* periodFlushed) = 0;
+    virtual bool addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,
+                                 bool* periodFlushed) = 0;
     virtual void endResync() = 0;
     virtual void setPeriod(nsecs_t period) = 0;
     virtual nsecs_t getPeriod() = 0;
@@ -125,7 +126,8 @@
     // down the DispSync model, and false otherwise.
     // periodFlushed will be set to true if mPendingPeriod is flushed to
     // mIntendedPeriod, and false otherwise.
-    bool addResyncSample(nsecs_t timestamp, bool* periodFlushed) override;
+    bool addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,
+                         bool* periodFlushed) override;
     void endResync() override;
 
     // The setPeriod method sets the vsync event model's period to a specific