Add RenderThread::GetShutdownEvent().

content/public/renderer/render_thread.h

Index: content/public/renderer/render_thread.h
diff --git a/content/public/renderer/render_thread.h b/content/public/renderer/render_thread.h
index 184da1ea5a0997231c2865263139cdb85774741a..4a4615e2c46968cc74c37699001ad8591d004a44 100644
--- a/content/public/renderer/render_thread.h
+++ b/content/public/renderer/render_thread.h
@@ -22,6 +22,7 @@ class GURL;
 namespace base {
 class MessageLoop;
 class MessageLoopProxy;
+class WaitableEvent;
 }
 
 namespace IPC {
@@ -121,6 +122,9 @@ class CONTENT_EXPORT RenderThread : public IPC::Sender {
   // proxy servers.
   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) = 0;
 
+  // Gets the shutdown event for the process.
+  virtual base::WaitableEvent* GetShutdownEvent() = 0;
+
 #if defined(OS_WIN)
   // Request that the given font be loaded by the browser so it's cached by the
   // OS. Please see ChildProcessHost::PreCacheFont for details.