Ensure that webkit is initialized before calling into it from devtools agent filter

content/renderer/devtools_agent_filter.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/devtools_agent_filter.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "content/common/devtools_messages.h"
 #include "content/renderer/devtools_agent.h"
 #include "content/renderer/plugin_channel_host.h"
+#include "content/renderer/render_thread.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDevToolsAgent.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 
 using WebKit::WebDevToolsAgent;
 using WebKit::WebString;
 
 namespace {
 
 class MessageImpl : public WebDevToolsAgent::MessageDescriptor {
  public:
@@ skipping 39 matching lines @@
   IPC_END_MESSAGE_MAP()
   return message_handled_;
 }
 
 void DevToolsAgentFilter::OnFilterAdded(IPC::Channel* channel) {
   channel_ = channel;
 }
 
 void DevToolsAgentFilter::OnDispatchOnInspectorBackend(
     const std::string& message) {
+  RenderThread::current()->EnsureWebKitInitialized();
   if (!WebDevToolsAgent::shouldInterruptForMessage(
           WebString::fromUTF8(message))) {
       message_handled_ = false;
       return;
   }
   WebDevToolsAgent::interruptAndDispatch(
       new MessageImpl(message, current_routing_id_));
 
   render_thread_loop_->PostTask(
       FROM_HERE, base::Bind(&WebDevToolsAgent::processPendingMessages));
 }