cc: Make scheduling be driven by vsync for android webview.

content/public/browser/android/synchronous_compositor.h

Index: content/public/browser/android/synchronous_compositor.h
diff --git a/content/public/browser/android/synchronous_compositor.h b/content/public/browser/android/synchronous_compositor.h
index 476b86dce8310bb235402a50a67bab4137f8fca5..be7920993b1fc87e77814009f2725206114b9625 100644
--- a/content/public/browser/android/synchronous_compositor.h
+++ b/content/public/browser/android/synchronous_compositor.h
@@ -87,6 +87,11 @@ class CONTENT_EXPORT SynchronousCompositor {
   // SynchronousCompositorClient::GetTotalRootLayerScrollOffset).
   virtual void DidChangeRootLayerScrollOffset() = 0;
 
+  // Called by the embedder to notify that the compositor is active. The
+  // compositor won't ask for vsyncs when it's inactive. NOTE: The compositor
+  // starts off as inactive and needs a SetActive(true) call to begin.
+  virtual void SetIsActive(bool is_active) = 0;
+
  protected:
   virtual ~SynchronousCompositor() {}
 };