Add IPC messages to transfer compositor protos

content/public/browser/render_widget_host.h

Index: content/public/browser/render_widget_host.h
diff --git a/content/public/browser/render_widget_host.h b/content/public/browser/render_widget_host.h
index fe4361ac15c5e39c4f2d9ed3df382f41bcd73d31..e5cadffb8c461574c4704ebc657418fff9a6ee26 100644
--- a/content/public/browser/render_widget_host.h
+++ b/content/public/browser/render_widget_host.h
@@ -245,6 +245,9 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Sender {
   virtual void GetWebScreenInfo(blink::WebScreenInfo* result) = 0;
   // Get the color profile corresponding to this render widget.
   virtual bool GetScreenColorProfile(std::vector<char>* color_profile) = 0;
+
+  // Sends a compositor proto to the render widget.
+  virtual void HandleCompositorProto(const std::vector<char>& proto) = 0;
 };
 
 }  // namespace content