Use a shared thread for media operations.

content/public/test/layouttest_support.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_TEST_LAYOUTTEST_SUPPORT_H_
 #define CONTENT_PUBLIC_TEST_LAYOUTTEST_SUPPORT_H_
 
 #include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
 
 namespace WebKit {
 class WebGamepads;
 struct WebSize;
 }
 
 namespace WebTestRunner {
 class WebTestProxyBase;
 }
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace content {
 
 class RenderView;
 
 // Enable injecting of a WebTestProxy between WebViews and RenderViews.
 // |callback| is invoked with a pointer to WebTestProxyBase for each created
 // WebTestProxy.
 void EnableWebTestProxyCreation(const base::Callback<
     void(RenderView*, WebTestRunner::WebTestProxyBase*)>& callback);
 
@@ skipping 36 matching lines @@
 
 // Set the device scale factor and force the compositor to resize.
 void SetDeviceScaleFactor(RenderView* render_view, float factor);
 
 // Disable system calls related to drag & drop.
 void DisableSystemDragDrop();
 
 // Don't show modal popup menus.
 void DisableModalPopupMenus();
 
+// Return the thread on which media operations should run.
+//
+// TODO(scherkus): We should be using RenderViewImpl::createMediaPlayer(), see
+// http://crbug.com/239826
+scoped_refptr<base::MessageLoopProxy> GetMediaThreadMessageLoopProxy();
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_LAYOUTTEST_SUPPORT_H_