Add IPC messages to transfer compositor protos

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 78491a5b7134c704300d6937f829f52906b03da3..215436153d01c3b08ccbf054c8be717e8bc7ea92 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -473,6 +473,8 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
                         OnImeCompositionRangeChanged)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidFirstPaintAfterLoad,
                         OnFirstPaintAfterLoad)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_SendCompositorProto,

[no sievers, 2015/11/14 00:13:43]

nit: it's slightly contradictory between Send/OnHandle. would the notion of
'ViewHostMsg_ForwardCompositorProto/OnForwardCompositorProto' make sense? or
'relay' or something?

[David Trainor- moved to gerrit, 2015/11/16 04:33:58]

Done.

+                        OnHandleCompositorProto)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -954,6 +956,12 @@ void RenderWidgetHostImpl::OnFirstPaintAfterLoad() {
   }
 }
 
+void RenderWidgetHostImpl::OnHandleCompositorProto(
+    const std::vector<char>& proto) {
+  if (delegate_)
+    delegate_->HandleCompositorProto(this, proto);
+}
+
 void RenderWidgetHostImpl::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
   ForwardMouseEventWithLatencyInfo(mouse_event, ui::LatencyInfo());
 }
@@ -1253,6 +1261,12 @@ bool RenderWidgetHostImpl::GetScreenColorProfile(
   return false;
 }
 
+void RenderWidgetHostImpl::HandleCompositorProto(

[no sievers, 2015/11/14 00:13:43]

oops, now i'm even more confused, 'Handle' overload :)
this goes into the other direction... so hhmm.. how about some notion of
'incoming' vs. 'outgoing' to differentiate?

[David Trainor- moved to gerrit, 2015/11/16 04:33:58]

Yeah this is weird.  I made it HandleCompositorProto for incoming and
ForwardCompositorProto for outgoing (after reading the previous comment).  I can
make this explicitly incoming/outgoing if you want though :).

+    const std::vector<char>& proto) {
+  DCHECK(!proto.empty());
+  Send(new ViewMsg_HandleCompositorProto(GetRoutingID(), proto));
+}
+
 void RenderWidgetHostImpl::NotifyScreenInfoChanged() {
   color_profile_out_of_date_ = true;