DevTools: add initial support for shared workers debugging

content/browser/debugger/devtools_handler.cc

Index: content/browser/debugger/devtools_handler.cc
diff --git a/content/browser/debugger/devtools_handler.cc b/content/browser/debugger/devtools_handler.cc
index 396ef1abc5233f43b97c5ef4dbbf48798da32356..fc97c408b6503edd3767337ccd1cde87bf49af1d 100644
--- a/content/browser/debugger/devtools_handler.cc
+++ b/content/browser/debugger/devtools_handler.cc
@@ -7,6 +7,7 @@
 #include "content/browser/debugger/devtools_file_util.h"
 #include "content/browser/debugger/devtools_manager.h"
 #include "content/browser/debugger/devtools_window.h"
+#include "content/browser/debugger/worker_devtools_manager_io.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/common/devtools_messages.h"
@@ -42,6 +43,9 @@ void DevToolsHandler::OnForwardToAgent(const IPC::Message& message) {
       render_view_host());
   if (!window)
     return;
+  if (WorkerDevToolsManagerIO::ForwardToWorkerDevToolsAgentOnUIThread(
+      window, message))
+    return;
   DevToolsManager::GetInstance()->ForwardToDevToolsAgent(window, message);
 }