cc: Implement unified BeginFrame on aura

content/browser/compositor/delegated_frame_host.h

Index: content/browser/compositor/delegated_frame_host.h
diff --git a/content/browser/compositor/delegated_frame_host.h b/content/browser/compositor/delegated_frame_host.h
index 5029fb3cc49e28ba9309cee103a7d8eec105fa09..bfe3f0582912b907759ea39b25d24c8bb94c1a0d 100644
--- a/content/browser/compositor/delegated_frame_host.h
+++ b/content/browser/compositor/delegated_frame_host.h
@@ -16,6 +16,7 @@
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/public/browser/render_process_host.h"
+#include "ui/base/compositor/compositor_begin_frame_observer.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_vsync_manager.h"
@@ -25,6 +26,7 @@
 
 namespace cc {
 class SurfaceFactory;
+struct BeginFrameArgs;
 }
 
 namespace media {
@@ -64,6 +66,8 @@ class CONTENT_EXPORT DelegatedFrameHostClient {
   virtual DelegatedFrameHost* GetDelegatedFrameHost() const = 0;
   virtual bool ShouldCreateResizeLock();
   virtual void RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request);
+
+  virtual void OnSendBeginFrame(const cc::BeginFrameArgs& args) = 0;
 };
 
 // The DelegatedFrameHost is used to host all of the RenderWidgetHostView state
@@ -72,6 +76,7 @@ class CONTENT_EXPORT DelegatedFrameHostClient {
 // the ui::Compositor associated with its DelegatedFrameHostClient.
 class CONTENT_EXPORT DelegatedFrameHost
     : public ui::CompositorObserver,
+      public ui::CompositorBeginFrameObserver,
       public ui::CompositorVSyncManager::Observer,
       public ui::LayerOwnerDelegate,
       public ImageTransportFactoryObserver,
@@ -112,6 +117,7 @@ class CONTENT_EXPORT DelegatedFrameHost
       scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber);
   void EndFrameSubscription();
   bool HasFrameSubscriber() const { return frame_subscriber_; }
+  void OnSetNeedsBeginFrames(bool needs_begin_frames);
 
   // Exposed for tests.
   cc::DelegatedFrameProvider* FrameProviderForTesting() const {
@@ -144,6 +150,11 @@ class CONTENT_EXPORT DelegatedFrameHost
   void LockResources();
   void UnlockResources();
 
+  void StartObservingBeginFrames();
+  void StopObservingBeginFrames();
+
+  void SetVSyncParams(base::TimeTicks timebase, base::TimeDelta interval);
+
   // Overridden from ui::CompositorObserver:
   void OnCompositingDidCommit(ui::Compositor* compositor) override;
   void OnCompositingStarted(ui::Compositor* compositor,
@@ -152,6 +163,9 @@ class CONTENT_EXPORT DelegatedFrameHost
   void OnCompositingAborted(ui::Compositor* compositor) override;
   void OnCompositingLockStateChanged(ui::Compositor* compositor) override;
 
+  // Overridden from ui::CompositorBeginFrameObserver:
+  void OnSendBeginFrame(const cc::BeginFrameArgs& args) override;
+
   // Overridden from ui::CompositorVSyncManager::Observer:
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval) override;
@@ -307,6 +321,17 @@ class CONTENT_EXPORT DelegatedFrameHost
       yuv_readback_pipeline_;
 
   scoped_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;
+
+  // True when unified BeginFrame scheduing is used.
+  bool begin_frame_scheduling_enabled_;
+
+  // True when RenderWidget needs a BeginFrame.
+  bool needs_begin_frames_;
+
+  // Pass |last_sent_begin_frame_args_| to compositor when |this| is added as a
+  // CompositorBeginFrameObserver. With this, Compositor can determine whether
+  // latest BeginFrameArgs can be used immediately or not.
+  cc::BeginFrameArgs last_sent_begin_frame_args_;
 };
 
 }  // namespace content