Add IPC messages to transfer compositor protos

content/public/browser/web_contents_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 492 matching lines @@
   // SECURITY_STYLE_UNKNOWN if not overriden.
   virtual SecurityStyle GetSecurityStyle(
       WebContents* web_contents,
       SecurityStyleExplanations* security_style_explanations);
 
   // Displays platform-specific (OS) dialog with the certificate details.
   virtual void ShowCertificateViewerInDevTools(
       WebContents* web_contents,
       int cert_id);
 
+  // Called when the active render widget is sending a compositor proto for this
+  // WebContents.
+  virtual void HandleCompositorProto(const std::vector<char>& proto) {}
+
  protected:
   virtual ~WebContentsDelegate();
 
  private:
   friend class WebContentsImpl;
 
   // Called when |this| becomes the WebContentsDelegate for |source|.
   void Attach(WebContents* source);
 
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_