Android: Throttle render compositor if browser (compositor) is behind.

content/browser/renderer_host/render_widget_host_view_android.h

 // Copyright (c) 2012 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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
+#include <queue>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process.h"
+#include "cc/layers/texture_layer_client.h"
 #include "content/browser/renderer_host/ime_adapter_android.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/vector2d_f.h"
 
 struct ViewHostMsg_TextInputState_Params;
 
@@ skipping 14 matching lines @@
 namespace content {
 class ContentViewCoreImpl;
 class RenderWidgetHost;
 class RenderWidgetHostImpl;
 class SurfaceTextureTransportClient;
 struct NativeWebKeyboardEvent;
 
 // -----------------------------------------------------------------------------
 // See comments in render_widget_host_view.h about this class and its members.
 // -----------------------------------------------------------------------------
-class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
+class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase,
+                                    public cc::TextureLayerClient {
  public:
   RenderWidgetHostViewAndroid(RenderWidgetHostImpl* widget,
                               ContentViewCoreImpl* content_view_core);
   virtual ~RenderWidgetHostViewAndroid();
 
   // RenderWidgetHostView implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
   virtual void InitAsChild(gfx::NativeView parent_view) OVERRIDE;
   virtual void InitAsPopup(RenderWidgetHostView* parent_host_view,
                            const gfx::Rect& pos) OVERRIDE;
@@ skipping 80 matching lines @@
       const std::vector<AccessibilityHostMsg_NotificationParams>&
           params) OVERRIDE;
   virtual bool LockMouse() OVERRIDE;
   virtual void UnlockMouse() OVERRIDE;
   virtual void HasTouchEventHandlers(bool need_touch_events) OVERRIDE;
   virtual void OnSwapCompositorFrame(
       scoped_ptr<cc::CompositorFrame> frame) OVERRIDE;
   virtual void ShowDisambiguationPopup(const gfx::Rect& target_rect,
                                        const SkBitmap& zoomed_bitmap) OVERRIDE;
 
+  // cc::TextureLayerClient implementation.
+  virtual unsigned PrepareTexture(cc::ResourceUpdateQueue* queue) OVERRIDE;
+  virtual WebKit::WebGraphicsContext3D* Context3d() OVERRIDE;
+  virtual bool PrepareTextureMailbox(cc::TextureMailbox* mailbox) OVERRIDE {
+    return false;
+  }
+
   // Non-virtual methods
   void SetContentViewCore(ContentViewCoreImpl* content_view_core);
   SkColor GetCachedBackgroundColor() const;
   void SendKeyEvent(const NativeWebKeyboardEvent& event);
   void SendTouchEvent(const WebKit::WebTouchEvent& event);
   void SendMouseEvent(const WebKit::WebMouseEvent& event);
   void SendMouseWheelEvent(const WebKit::WebMouseWheelEvent& event);
   void SendGestureEvent(const WebKit::WebGestureEvent& event);
 
   void OnProcessImeBatchStateAck(bool is_begin);
@@ skipping 13 matching lines @@
   void SelectRange(const gfx::Point& start, const gfx::Point& end);
 
   void MoveCaret(const gfx::Point& point);
 
  private:
   void BuffersSwapped(const gpu::Mailbox& mailbox,
                       const gfx::Size texture_size,
                       const gfx::SizeF content_size,
                       const base::Closure& ack_callback);
 
+  void RunAckCallbacks();
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
   // Whether or not this widget is potentially attached to the view hierarchy.
   // This view may not actually be attached if this is true, but it should be
   // treated as such, because as soon as a ContentViewCore is set the layer
   // will be attached automatically.
   bool is_layer_attached_;
 
   // ContentViewCoreImpl is our interface to the view system.
@@ skipping 20 matching lines @@
 
   // Used for image transport when needing to share resources across threads.
   scoped_ptr<SurfaceTextureTransportClient> surface_texture_transport_;
 
   // The mailbox of the previously received frame.
   gpu::Mailbox current_mailbox_;
 
   // The mailbox of the frame we last returned.
   gpu::Mailbox last_mailbox_;
 
+  bool consumed_current_texture_;
+
+  std::queue<base::Closure> ack_callbacks_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_