Introduce worker_devtools_agent_route_id for EmbeddedWorker.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 4833f16c672b70dd2bb14a661ab62eb4a70a32cf..dd5e3674d9ed535c3f5967559ea5a74f1a1849ff 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -220,6 +220,11 @@ class CONTENT_EXPORT RenderProcessHostImpl
   static void RegisterRendererMainThreadFactory(
       RendererMainThreadFactoryFunction create);
 
+  // Gets the next available routing id of the proccess on IO thread.

[kinuko, 2014/04/28 07:09:52]

Please explicitly note that this method needs to be called on IO thread, this
comment sounds still unclear about what 'on IO thread' qualifies.

[horo, 2014/04/28 07:29:42]

Done.

+  // Returns MSG_ROUTING_NONE if failed.
+  // If the caller is on UI thread it can directly call GetNextRoutingID.
+  static int GetNextRoutingIDForProcess(int render_process_id);
+
 #if defined(OS_ANDROID)
   const scoped_refptr<BrowserDemuxerAndroid>& browser_demuxer_android() {
     return browser_demuxer_android_;