Make Platform::queryStorageUsageAndQuota work from worker threads

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index 211c567114cbfd638a28ed9185a84cba2ffdb8f2..e94c29a38823759d992998749488e2d7e98ab597 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -19,6 +19,7 @@
 #include "content/child/indexed_db/proxy_webidbfactory_impl.h"
 #include "content/child/npapi/npobject_util.h"
 #include "content/child/quota_dispatcher.h"
+#include "content/child/quota_message_filter.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/child/webblobregistry_impl.h"
 #include "content/child/webmessageportchannel_impl.h"
@@ -248,6 +249,7 @@ RendererWebKitPlatformSupportImpl::RendererWebKitPlatformSupportImpl()
   if (ChildThread::current()) {
     sync_message_filter_ = ChildThread::current()->sync_message_filter();
     thread_safe_sender_ = ChildThread::current()->thread_safe_sender();
+    quota_message_filter_ = ChildThread::current()->quota_message_filter();
   }
 }
 
@@ -1162,10 +1164,14 @@ void RendererWebKitPlatformSupportImpl::queryStorageUsageAndQuota(
     const WebKit::WebURL& storage_partition,
     WebKit::WebStorageQuotaType type,
     WebKit::WebStorageQuotaCallbacks* callbacks) {
-  ChildThread::current()->quota_dispatcher()->QueryStorageUsageAndQuota(
-      storage_partition,
-      static_cast<quota::StorageType>(type),
-      QuotaDispatcher::CreateWebStorageQuotaCallbacksWrapper(callbacks));
+  if (!thread_safe_sender_.get() || !quota_message_filter_.get())
+    return;
+  QuotaDispatcher::ThreadSpecificInstance(
+      thread_safe_sender_.get(),
+      quota_message_filter_.get())->QueryStorageUsageAndQuota(
+          storage_partition,
+          static_cast<quota::StorageType>(type),
+          QuotaDispatcher::CreateWebStorageQuotaCallbacksWrapper(callbacks));
 }
 
 }  // namespace content