Track webcore worker message loops in chromium.

content/common/child_thread.h

Index: content/common/child_thread.h
diff --git a/content/common/child_thread.h b/content/common/child_thread.h
index acb1e3ab4781dd23cdeea83afbca6489fa032bd2..fda01a78dce4b11ca24bf541a64d4f8b804eb942 100644
--- a/content/common/child_thread.h
+++ b/content/common/child_thread.h
@@ -18,6 +18,7 @@ class MessageLoop;
 class QuotaDispatcher;
 class ResourceDispatcher;
 class SocketStreamDispatcher;
+class WorkerTaskRunner;
 
 namespace IPC {
 class SyncChannel;
@@ -79,6 +80,8 @@ class CONTENT_EXPORT ChildThread : public IPC::Channel::Listener,
   // Returns the one child thread.
   static ChildThread* current();
 
+  WorkerTaskRunner* worker_task_runner() const;
+
  protected:
   friend class ChildProcess;
 
@@ -140,6 +143,8 @@ class CONTENT_EXPORT ChildThread : public IPC::Channel::Listener,
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
+  scoped_refptr<WorkerTaskRunner> worker_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };