Add a menu item to content_shell to open devtools to make it more discoverable.

content/browser/debugger/devtools_http_handler_impl.h

Index: content/browser/debugger/devtools_http_handler_impl.h
===================================================================
--- content/browser/debugger/devtools_http_handler_impl.h	(revision 150609)
+++ content/browser/debugger/devtools_http_handler_impl.h	(working copy)
@@ -53,6 +53,7 @@
   virtual void Stop() OVERRIDE;
   virtual void SetRenderViewHostBinding(
       RenderViewHostBinding* binding) OVERRIDE;
+  virtual GURL GetFrontendURL(RenderViewHost* render_view_host) OVERRIDE;
 
   // net::HttpServer::Delegate implementation.
   virtual void OnHttpRequest(int connection_id,
@@ -64,16 +65,13 @@
                                   const std::string& data) OVERRIDE;
   virtual void OnClose(int connection_id) OVERRIDE;
 
-  PageList GeneratePageList();
+  void OnJsonRequestUI(int connection_id,
+                       const net::HttpServerRequestInfo& info);
+  void OnWebSocketRequestUI(int connection_id,
+                            const net::HttpServerRequestInfo& info);
+  void OnWebSocketMessageUI(int connection_id, const std::string& data);
+  void OnCloseUI(int connection_id);
 
-  virtual void OnJsonRequestUI(int connection_id,
-                               const net::HttpServerRequestInfo& info);
-  virtual void OnWebSocketRequestUI(int connection_id,
-                                    const net::HttpServerRequestInfo& info);
-  virtual void OnWebSocketMessageUI(int connection_id,
-                                    const std::string& data);
-  virtual void OnCloseUI(int connection_id);
-
   // net::URLRequest::Delegate implementation.
   virtual void OnResponseStarted(net::URLRequest* request) OVERRIDE;
   virtual void OnReadCompleted(net::URLRequest* request,
@@ -93,6 +91,12 @@
   void AcceptWebSocket(int connection_id,
                        const net::HttpServerRequestInfo& request);
 
+  PageList GeneratePageList();
+
+  // Returns the front end url without the host at the beginning.
+  std::string GetFrontendURLInternal(const std::string rvh_id,
+                                     const std::string& host);
+
   std::string overridden_frontend_url_;
   scoped_ptr<const net::StreamListenSocketFactory> socket_factory_;
   scoped_refptr<net::HttpServer> server_;