cc: Add SetChildrenNeedBeginFrames() & SendBeginFramesToChildren()

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index fa300dea4c7b03efdf8a9a54e5e8584b6a973fd5..acb16006a92acc545a44542e59329c31a16f56e9 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -59,6 +59,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   bool SupportsImplScrolling() const override;
   void AsValueInto(base::debug::TracedValue* state) const override;
   bool MainFrameWillHappenForTesting() override;
+  void SetChildrenNeedBeginFrames(bool children_need_begin_frames) override;
 
   // SchedulerClient implementation
   void WillBeginImplFrame(const BeginFrameArgs& args) override;
@@ -76,6 +77,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   base::TimeDelta BeginMainFrameToCommitDurationEstimate() override;
   base::TimeDelta CommitToActivateDurationEstimate() override;
   void DidBeginImplFrameDeadline() override;
+  void SendBeginFramesToChildren(const BeginFrameArgs& args) override;
 
   // LayerTreeHostImplClient implementation
   void UpdateRendererCapabilitiesOnImplThread() override;