Implement vsync notification on Android

content/public/android/java/src/org/chromium/content/browser/VSyncManager.java

Index: content/public/android/java/src/org/chromium/content/browser/VSyncManager.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/VSyncManager.java b/content/public/android/java/src/org/chromium/content/browser/VSyncManager.java
new file mode 100644
index 0000000000000000000000000000000000000000..1df30994ae1bdb2ed75e78c2a0f112d431d6b823
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/VSyncManager.java
@@ -0,0 +1,34 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content.browser;
+
+public abstract class VSyncManager {
+    /**
+     * Interface for requesting notification of the display vsync signal.
+     * The provider will call Listener.onVSync() to notify about vsync.
+     */
+    public static interface Provider {
+        void setVSyncNotificationEnabled(Listener listener, boolean enable);
+    }
+
+    /**
+     * Interface for receiving vsync notifications and information about the display refresh
+     * interval.
+     */
+    public static interface Listener {
+        /**
+         * Notification of a vsync event.
+         * @param frameTimeMicros The latest vsync frame time in microseconds.
+         */
+        void onVSync(long frameTimeMicros);
+
+        /**
+         * Update with the latest vsync parameters.
+         * @param tickTimeMicros The latest vsync tick time in microseconds.
+         * @param intervalMicros The vsync interval in microseconds.
+         */
+        void updateVSync(long tickTimeMicros, long intervalMicros);
+    }
+}