Introduce worker_devtools_agent_route_id for EmbeddedWorker.

content/browser/renderer_host/render_process_host_impl.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_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 202 matching lines @@
       const GURL& url);
 
   static base::MessageLoop* GetInProcessRendererThreadForTesting();
 
   // This forces a renderer that is running "in process" to shut down.
   static void ShutDownInProcessRenderer();
 
   static void RegisterRendererMainThreadFactory(
       RendererMainThreadFactoryFunction create);
 
+  // Gets the next available routing id of the proccess. Returns
+  // MSG_ROUTING_NONE if failed. This method needs to be called on IO thread.
+  // If the caller is on UI thread it can directly call GetNextRoutingID.
+  static int GetNextRoutingIDForProcess(int render_process_id);

[jam, 2014/04/29 06:28:22]

i don't see the point of adding this method on RenderProcessHostImpl for two
reasons:
-all the methods are called on the UI threads, so it's better to keep the class
used on one thread only to avoid confusion
-this method doesn't use any internal RPH state, and it's called in one place,
so just move that implementation there

[horo, 2014/04/29 06:54:39]

Done.

+
 #if defined(OS_ANDROID)
   const scoped_refptr<BrowserDemuxerAndroid>& browser_demuxer_android() {
     return browser_demuxer_android_;
   }
 #endif
 
   MessagePortMessageFilter* message_port_message_filter() const {
     return message_port_message_filter_;
   }
 
@@ skipping 191 matching lines @@
   base::TimeTicks survive_for_worker_start_time_;
 
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_