sync compositor: Remove begin frame source

content/public/browser/android/synchronous_compositor.h

 // Copyright 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 72 matching lines @@
   // Should be called by the embedder after the embedder had modified the
   // scroll offset of the root layer.
   virtual void DidChangeRootLayerScrollOffset(
       const gfx::ScrollOffset& root_offset) = 0;
 
   // Allows embedder to synchronously update the zoom level, ie page scale
   // factor, around the anchor point.
   virtual void SynchronouslyZoomBy(float zoom_delta,
                                    const gfx::Point& anchor) = 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;
-
   // Called by the embedder to notify that the OnComputeScroll step is happening
   // and if any input animation is active, it should tick now.
   virtual void OnComputeScroll(base::TimeTicks animation_time) = 0;
 
  protected:
   virtual ~SynchronousCompositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_