aw: Block child compositor if frame is not consumed by parent

android_webview/browser/shared_renderer_state.h

 // Copyright 2014 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 ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 #define ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 35 matching lines @@
 // This class is used to pass data between UI thread and RenderThread.
 class SharedRendererState {
  public:
   SharedRendererState(scoped_refptr<base::MessageLoopProxy> ui_loop,
                       BrowserViewRendererClient* client);
   ~SharedRendererState();
 
   void ClientRequestDrawGL();
   void DidDrawGLProcess();
 
+  bool HasDrawGLInput() const;
   void SetDrawGLInput(scoped_ptr<DrawGLInput> input);
   scoped_ptr<DrawGLInput> PassDrawGLInput();
 
   bool IsInsideHardwareRelease() const;
   void UpdateDrawConstraints(
       const ParentCompositorDrawConstraints& parent_draw_constraints);
   void PostExternalDrawConstraintsToChildCompositor(
       const ParentCompositorDrawConstraints& parent_draw_constraints);
 
   const ParentCompositorDrawConstraints ParentDrawConstraints() const;
@@ skipping 37 matching lines @@
 
  private:
   SharedRendererState* shared_renderer_state_;
 
   DISALLOW_COPY_AND_ASSIGN(InsideHardwareReleaseReset);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_