Enable BeginFrame scheduling on aura

content/browser/renderer_host/begin_frame_observer_proxy.h

Index: content/browser/renderer_host/begin_frame_observer_proxy.h
diff --git a/content/browser/renderer_host/begin_frame_observer_proxy.h b/content/browser/renderer_host/begin_frame_observer_proxy.h
index fd2aa6d7a06f9507033048bfc843906e60c3b719..3e3574a008984be0eaafa5060fcb391f2a264582 100644
--- a/content/browser/renderer_host/begin_frame_observer_proxy.h
+++ b/content/browser/renderer_host/begin_frame_observer_proxy.h
@@ -25,7 +25,8 @@ class BeginFrameObserverProxyClient {
 // This class is used to manage all of the RenderWidgetHostView state and
 // functionality that is associated with BeginFrame message handling.
 class CONTENT_EXPORT BeginFrameObserverProxy
-    : public ui::CompositorBeginFrameObserver {
+    : public ui::CompositorBeginFrameObserver,
+      public ui::CompositorObserver {
  public:
   explicit BeginFrameObserverProxy(BeginFrameObserverProxyClient* client);
   ~BeginFrameObserverProxy() override;
@@ -38,6 +39,15 @@ class CONTENT_EXPORT BeginFrameObserverProxy
   // Overridden from ui::CompositorBeginFrameObserver:
   void OnSendBeginFrame(const cc::BeginFrameArgs& args) override;
 
+  // Overridden from ui::CompositorObserver:
+  void OnCompositingDidCommit(ui::Compositor* compositor) override {}
+  void OnCompositingStarted(ui::Compositor* compositor,
+                            base::TimeTicks start_time) override {}
+  void OnCompositingEnded(ui::Compositor* compositor) override {}
+  void OnCompositingAborted(ui::Compositor* compositor) override {}
+  void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
+  void OnCompositingShuttingDown(ui::Compositor* compositor) override;
+
  private:
   void StartObservingBeginFrames();
   void StopObservingBeginFrames();