Remove SendBeginFramesToChildren plumbing

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index ddb1a16ae6f3a926d02cbb523666db9e6b7f6802..1c9ce1e430de8821450808b9dd533f7c5999f680 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -482,6 +482,44 @@ void RenderWidgetHostViewMac::DelegatedFrameHostUpdateVSyncParameters(
   render_widget_host_->UpdateVSyncParameters(timebase, interval);
 }
 
+void RenderWidgetHostViewMac::SetBeginFrameSource(
+    cc::BeginFrameSource* source) {
+  if (begin_frame_source_ && needs_begin_frames_)
+    begin_frame_source_->RemoveObserver(this);
+  begin_frame_source_ = source;
+  if (begin_frame_source_ && needs_begin_frames_)
+    begin_frame_source_->AddObserver(this);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// cc::BeginFrameSourceBase, public:
+
+void RenderWidgetHostViewMac::OnSetNeedsBeginFrames(bool needs_begin_frames) {
+  if (needs_begin_frames_ == needs_begin_frames)
+    return;
+
+  needs_begin_frames_ = needs_begin_frames;
+  if (begin_frame_source_) {
+    if (needs_begin_frames_)
+      begin_frame_source_->AddObserver(this);
+    else
+      begin_frame_source_->RemoveObserver(this);
+  }
+}
+
+bool RenderWidgetHostViewMac::OnBeginFrameDerivedImpl(
+    const cc::BeginFrameArgs& args) {
+  delegated_frame_host_->SetVSyncParameters(args.frame_time, args.interval);
+  render_widget_host_->Send(
+      new ViewMsg_BeginFrame(render_widget_host_->GetRoutingID(), args));
+  return true;
+}
+
+void RenderWidgetHostViewMac::OnBeginFrameSourcePausedChanged(
+    bool paused) {
+  // Nothing to do here.
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // AcceleratedWidgetMacNSView, public:
 
@@ -527,7 +565,9 @@ RenderWidgetHostViewMac::RenderWidgetHostViewMac(RenderWidgetHost* widget,
       allow_pause_for_resize_or_repaint_(true),
       is_guest_view_hack_(is_guest_view_hack),
       wheel_gestures_enabled_(UseGestureBasedWheelScrolling()),
-      fullscreen_parent_host_view_(NULL),
+      fullscreen_parent_host_view_(nullptr),
+      begin_frame_source_(nullptr),
+      needs_begin_frames_(false),
       weak_factory_(this) {
   // |cocoa_view_| owns us and we will be deleted when |cocoa_view_|
   // goes away.  Since we autorelease it, our caller must put
@@ -687,6 +727,8 @@ bool RenderWidgetHostViewMac::OnMessageReceived(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(RenderWidgetHostViewMac, message)
     IPC_MESSAGE_HANDLER(ViewMsg_GetRenderedTextCompleted,
         OnGetRenderedTextCompleted)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_SetNeedsBeginFrames,
+                        OnSetNeedsBeginFrames)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;