cc: Add SetChildrenNeedBeginFrames() & SendBeginFramesToChildren()

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index adccf725d7aa7e1abf4061120964227af495fb00..25a4605abe27d6bb84e91699402ab32f1005447e 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -175,6 +175,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void SetDebugState(const LayerTreeDebugState& debug_state) override;
   void AsValueInto(base::debug::TracedValue* value) const override;
   bool MainFrameWillHappenForTesting() override;
+  void SetChildrenNeedBeginFrames(bool children_need_begin_frames) override;
 
   // LayerTreeHostImplClient implementation
   void UpdateRendererCapabilitiesOnImplThread() override;
@@ -224,6 +225,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   base::TimeDelta BeginMainFrameToCommitDurationEstimate() override;
   base::TimeDelta CommitToActivateDurationEstimate() override;
   void DidBeginImplFrameDeadline() override;
+  void SendBeginFramesToChildren(const BeginFrameArgs& args) override;
 
   // ResourceUpdateControllerClient implementation
   void ReadyToFinalizeTextureUpdates() override;