Make Platform::queryStorageUsageAndQuota work from worker threads

content/worker/worker_webkitplatformsupport_impl.cc

Index: content/worker/worker_webkitplatformsupport_impl.cc
diff --git a/content/worker/worker_webkitplatformsupport_impl.cc b/content/worker/worker_webkitplatformsupport_impl.cc
index 9832a42c9b1c8bbf15757a3d3cf7fc878b0f4d74..50328c43b00b8019d9441d8b0e2ae77f2bcb88bc 100644
--- a/content/worker/worker_webkitplatformsupport_impl.cc
+++ b/content/worker/worker_webkitplatformsupport_impl.cc
@@ -13,6 +13,7 @@
 #include "content/child/fileapi/webfilesystem_impl.h"
 #include "content/child/indexed_db/proxy_webidbfactory_impl.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"
@@ -76,10 +77,12 @@ bool WorkerWebKitPlatformSupportImpl::FileUtilities::getFileInfo(
 
 WorkerWebKitPlatformSupportImpl::WorkerWebKitPlatformSupportImpl(
     ThreadSafeSender* sender,
-    IPC::SyncMessageFilter* sync_message_filter)
+    IPC::SyncMessageFilter* sync_message_filter,
+    QuotaMessageFilter* quota_message_filter)
     : thread_safe_sender_(sender),
       child_thread_loop_(base::MessageLoopProxy::current()),
-      sync_message_filter_(sync_message_filter) {
+      sync_message_filter_(sync_message_filter),
+      quota_message_filter_(quota_message_filter) {
 }
 
 WorkerWebKitPlatformSupportImpl::~WorkerWebKitPlatformSupportImpl() {
@@ -302,10 +305,14 @@ void WorkerWebKitPlatformSupportImpl::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