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..a115ff44451ac14e9f0b64365977198dd84a1572 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -220,6 +220,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   static void RegisterRendererMainThreadFactory(
       RendererMainThreadFactoryFunction create);
 
+  // Gets the next available routing id of the proccess.
+  // Returns MSG_ROUTING_NONE if failed.
+  static int GetNextRoutingIDForProcess(int render_process_id);

[kinuko, 2014/04/28 04:31:29]

Per comment in RenderWidgetHelper::FromProcessHostID this needs to be called on
IO thread, while most (if not all) of public RenderProcessHostImpl methods are
supposed to be called on UI thread. Would be definitely good to comment about
that.. and probably it could also note that if the caller is on UI thread it can
directly call GetNextRoutingID().

[horo, 2014/04/28 04:51:23]

Done.

+
 #if defined(OS_ANDROID)
   const scoped_refptr<BrowserDemuxerAndroid>& browser_demuxer_android() {
     return browser_demuxer_android_;