Revert of Remove burst mode from VSyncMonitor.

ui/android/java/src/org/chromium/ui/VSyncMonitor.java

Index: ui/android/java/src/org/chromium/ui/VSyncMonitor.java
diff --git a/ui/android/java/src/org/chromium/ui/VSyncMonitor.java b/ui/android/java/src/org/chromium/ui/VSyncMonitor.java
index 935df011032876d5cf303a6af140b3e8a54f95ab..58055857901045caf862fef636e24d4a291d7cd0 100644
--- a/ui/android/java/src/org/chromium/ui/VSyncMonitor.java
+++ b/ui/android/java/src/org/chromium/ui/VSyncMonitor.java
@@ -15,6 +15,9 @@
 
 /**
  * Notifies clients of the default displays's vertical sync pulses.
+ * This class works in "burst" mode: once the update is requested, the listener will be
+ * called MAX_VSYNC_COUNT times on the vertical sync pulses (on JB) or on every refresh
+ * period (on ICS, see below), unless stop() is called.
  * On ICS, VSyncMonitor relies on setVSyncPointForICS() being called to set a reasonable
  * approximation of a vertical sync starting point; see also http://crbug.com/156397.
  */
@@ -23,6 +26,7 @@
     private static final long NANOSECONDS_PER_SECOND = 1000000000;
     private static final long NANOSECONDS_PER_MILLISECOND = 1000000;
     private static final long NANOSECONDS_PER_MICROSECOND = 1000;
+    public static final int MAX_AUTO_ONVSYNC_COUNT = 5;
 
     /**
      * VSync listener class
@@ -42,6 +46,7 @@
     private final long mRefreshPeriodNano;
 
     private boolean mHaveRequestInFlight;
+    private int mTriggerNextVSyncCount;
 
     // Choreographer is used to detect vsync on >= JB.
     private final Choreographer mChoreographer;
@@ -79,6 +84,7 @@
                 .getDefaultDisplay().getRefreshRate();
         if (refreshRate <= 0) refreshRate = 60;
         mRefreshPeriodNano = (long) (NANOSECONDS_PER_SECOND / refreshRate);
+        mTriggerNextVSyncCount = 0;
 
         if (enableJBVSync && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
             // Use Choreographer on JB+ to get notified of vsync.
@@ -139,13 +145,16 @@
      * after this function is called.
      */
     public void stop() {
+        mTriggerNextVSyncCount = 0;
     }
 
     /**
      * Request to be notified of the closest display vsync events.
      * Listener.onVSync() will be called soon after the upcoming vsync pulses.
+     * It will be called at most MAX_AUTO_ONVSYNC_COUNT times unless requestUpdate() is called.
      */
     public void requestUpdate() {
+        mTriggerNextVSyncCount = MAX_AUTO_ONVSYNC_COUNT;
         postCallback();
     }
 
@@ -165,6 +174,10 @@
         assert mHaveRequestInFlight;
         mHaveRequestInFlight = false;
         mLastVSyncCpuTimeNano = currentTimeNanos;
+        if (mTriggerNextVSyncCount >= 0) {
+            mTriggerNextVSyncCount--;
+            postCallback();
+        }
         if (mListener != null) {
             mListener.onVSync(this, frameTimeNanos / NANOSECONDS_PER_MICROSECOND);
         }