Track webcore worker message loops in chromium.

content/common/child_thread.cc

Index: content/common/child_thread.cc
diff --git a/content/common/child_thread.cc b/content/common/child_thread.cc
index 9988e279310ece37cce4ce15daf488afe473e735..009a36dac985dc64dc10f54f2df70ea4cbf62333 100644
--- a/content/common/child_thread.cc
+++ b/content/common/child_thread.cc
@@ -17,6 +17,7 @@
 #include "content/common/quota_dispatcher.h"
 #include "content/common/resource_dispatcher.h"
 #include "content/common/socket_stream_dispatcher.h"
+#include "content/common/worker_task_runner.h"
 #include "content/public/common/content_switches.h"
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_sync_channel.h"
@@ -60,6 +61,8 @@ void ChildThread::Init() {
       new IPC::SyncMessageFilter(ChildProcess::current()->GetShutDownEvent());
   channel_->AddFilter(sync_message_filter_.get());
   channel_->AddFilter(new ChildTraceMessageFilter());
+
+  worker_task_runner_ = new WorkerTaskRunner;
 }
 
 ChildThread::~ChildThread() {
@@ -270,3 +273,7 @@ void ChildThread::OnProcessFinalRelease() {
   // The browser then sends back a response if it's ok to shutdown.
   Send(new ChildProcessHostMsg_ShutdownRequest);
 }
+
+WorkerTaskRunner* ChildThread::worker_task_runner() const {
+  return worker_task_runner_.get();
+}