Introduce intercepting and handling devtools messages in the renderer.

content/browser/devtools/devtools_http_handler_impl.cc

Index: content/browser/devtools/devtools_http_handler_impl.cc
diff --git a/content/browser/devtools/devtools_http_handler_impl.cc b/content/browser/devtools/devtools_http_handler_impl.cc
index c629892b1c1925de671cfb7b8efe4fd8de2bd01e..506a47988e97c831b89cfa4f769e6046160759ec 100644
--- a/content/browser/devtools/devtools_http_handler_impl.cc
+++ b/content/browser/devtools/devtools_http_handler_impl.cc
@@ -623,7 +623,8 @@ void DevToolsHttpHandlerImpl::OnWebSocketRequestUI(
     }
     browser_target_.reset(new DevToolsBrowserTarget(
         thread_->message_loop_proxy().get(), server_.get(), connection_id));
-    browser_target_->RegisterDomainHandler(new DevToolsTracingHandler());
+    browser_target_->RegisterDomainHandler(
+        new DevToolsTracingHandler(browser_target_->GetNotifier()));

[pfeldman, 2013/02/13 17:38:24]

It is unfortunate browser target can't set itself as a notifier - your
overriding implementation that doesn't need notifications becomes overly
complex. I'd suggest adding public SetNotifier on Handler intead.

[kkania, 2013/02/13 19:17:19]

Done.

     AcceptWebSocket(connection_id, request);
     return;
   }