Make Platform::queryStorageUsageAndQuota work from worker threads

content/renderer/renderer_webkitplatformsupport_impl.h

Index: content/renderer/renderer_webkitplatformsupport_impl.h
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.h b/content/renderer/renderer_webkitplatformsupport_impl.h
index 6e4c3d065d5319772cfd59eb5db1ad772b1c3e29..6659a05b25b5f576c779ab53a6ae6a42d10d9cec 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.h
+++ b/content/renderer/renderer_webkitplatformsupport_impl.h
@@ -35,6 +35,7 @@ class WebGraphicsContext3DProvider;
 namespace content {
 class DeviceMotionEventPump;
 class GamepadSharedMemoryReader;
+class QuotaMessageFilter;
 class RendererClipboardClient;
 class ThreadSafeSender;
 class WebClipboardImpl;
@@ -210,6 +211,7 @@ class CONTENT_EXPORT RendererWebKitPlatformSupportImpl
   scoped_refptr<base::MessageLoopProxy> child_thread_loop_;
   scoped_refptr<IPC::SyncMessageFilter> sync_message_filter_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
+  scoped_refptr<QuotaMessageFilter> quota_message_filter_;
 
   scoped_refptr<cc::ContextProvider> shared_offscreen_context_;