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

BUG=none
TEST=happier avi (and tree)

Review URL: http://codereview.chromium.org/8802016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113001 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/devtools_agent_filter.cc

@@ -9,6 +9,7 @@
 #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"
 
@@ -68,6 +69,7 @@ void DevToolsAgentFilter::OnFilterAdded(IPC::Channel* channel) {
 
 void DevToolsAgentFilter::OnDispatchOnInspectorBackend(
     const std::string& message) {
+  RenderThread::current()->EnsureWebKitInitialized();
   if (!WebDevToolsAgent::shouldInterruptForMessage(
           WebString::fromUTF8(message))) {
       message_handled_ = false;