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 fedd88ecbd7564ac9b684448b36a1b20284d1f3f..492a5e4c94d1a70cc874651ecca0a2530b685c3e 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"
@@ -28,6 +29,10 @@
 #include "content/common/handle_enumerator_win.h"
 #endif
 
+base::LazyInstance<WorkerTaskRunner,
+    base::LeakyLazyInstanceTraits<WorkerTaskRunner> >
+    ChildThread::worker_task_runner_= LAZY_INSTANCE_INITIALIZER;
+
 ChildThread::ChildThread() {
   channel_name_ = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
       switches::kProcessChannelID);
@@ -270,3 +275,7 @@ 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_.Pointer();
+}