Make Platform::queryStorageUsageAndQuota work from worker threads

content/child/quota_dispatcher.cc

Index: content/child/quota_dispatcher.cc
diff --git a/content/child/quota_dispatcher.cc b/content/child/quota_dispatcher.cc
index 69bec35f44d512c9db5d88c947f5e93eee6c4fad..4dd7431bc4615eb7b0f91e5c8a7531ed94067db2 100644
--- a/content/child/quota_dispatcher.cc
+++ b/content/child/quota_dispatcher.cc
@@ -5,7 +5,11 @@
 #include "content/child/quota_dispatcher.h"
 
 #include "base/basictypes.h"
+#include "base/lazy_instance.h"
+#include "base/threading/thread_local.h"
 #include "content/child/child_thread.h"
+#include "content/child/quota_message_filter.h"
+#include "content/child/thread_safe_sender.h"
 #include "content/common/quota_messages.h"
 #include "third_party/WebKit/public/web/WebStorageQuotaCallbacks.h"
 #include "third_party/WebKit/public/web/WebStorageQuotaType.h"
@@ -18,7 +22,13 @@ using WebKit::WebStorageQuotaCallbacks;
 using WebKit::WebStorageQuotaError;
 using WebKit::WebStorageQuotaType;
 
+using webkit_glue::WorkerTaskRunner;
+
 namespace content {
+
+static base::LazyInstance<base::ThreadLocalPointer<QuotaDispatcher> >::Leaky
+    g_quota_dispatcher_tls = LAZY_INSTANCE_INITIALIZER;
+
 namespace {
 
 // QuotaDispatcher::Callback implementation for WebStorageQuotaCallbacks.
@@ -46,7 +56,11 @@ class WebStorageQuotaDispatcherCallback : public QuotaDispatcher::Callback {
 
 }  // namespace
 
-QuotaDispatcher::QuotaDispatcher() {
+QuotaDispatcher::QuotaDispatcher(ThreadSafeSender* thread_safe_sender,
+                                 QuotaMessageFilter* quota_message_filter)
+    : thread_safe_sender_(thread_safe_sender),
+      quota_message_filter_(quota_message_filter) {
+  g_quota_dispatcher_tls.Pointer()->Set(this);
 }
 
 QuotaDispatcher::~QuotaDispatcher() {
@@ -55,9 +69,28 @@ QuotaDispatcher::~QuotaDispatcher() {
     iter.GetCurrentValue()->DidFail(quota::kQuotaErrorAbort);
     iter.Advance();
   }
+
+  g_quota_dispatcher_tls.Pointer()->Set(NULL);
+}
+
+QuotaDispatcher* QuotaDispatcher::ThreadSpecificInstance(
+    ThreadSafeSender* thread_safe_sender,
+    QuotaMessageFilter* quota_message_filter) {
+  if (g_quota_dispatcher_tls.Pointer()->Get())
+    return g_quota_dispatcher_tls.Pointer()->Get();
+
+  QuotaDispatcher* dispatcher = new QuotaDispatcher(
+      thread_safe_sender, quota_message_filter);
+  if (WorkerTaskRunner::Instance()->CurrentWorkerId())
+    WorkerTaskRunner::Instance()->AddStopObserver(dispatcher);
+  return dispatcher;
+}
+
+void QuotaDispatcher::OnWorkerRunLoopStopped() {
+  delete this;
 }
 
-bool QuotaDispatcher::OnMessageReceived(const IPC::Message& msg) {
+void QuotaDispatcher::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(QuotaDispatcher, msg)
     IPC_MESSAGE_HANDLER(QuotaMsg_DidGrantStorageQuota,
@@ -67,7 +100,7 @@ bool QuotaDispatcher::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(QuotaMsg_DidFail, DidFail);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
-  return handled;
+  DCHECK(handled) << "Unhandled message:" << msg.type();
 }
 
 void QuotaDispatcher::QueryStorageUsageAndQuota(
@@ -76,7 +109,9 @@ void QuotaDispatcher::QueryStorageUsageAndQuota(
     Callback* callback) {
   DCHECK(callback);
   int request_id = pending_quota_callbacks_.Add(callback);
-  ChildThread::current()->Send(new QuotaHostMsg_QueryStorageUsageAndQuota(
+  int thread_id = WorkerTaskRunner::Instance()->CurrentWorkerId();
+  quota_message_filter_->RegisterRequestID(request_id, thread_id);
+  thread_safe_sender_->Send(new QuotaHostMsg_QueryStorageUsageAndQuota(
       request_id, origin_url, type));
 }
 
@@ -88,7 +123,10 @@ void QuotaDispatcher::RequestStorageQuota(
     Callback* callback) {
   DCHECK(callback);
   int request_id = pending_quota_callbacks_.Add(callback);
-  ChildThread::current()->Send(new QuotaHostMsg_RequestStorageQuota(
+  int thread_id = WorkerTaskRunner::Instance()->CurrentWorkerId();
+  DCHECK(thread_id == 0);
+  quota_message_filter_->RegisterRequestID(request_id, thread_id);
+  thread_safe_sender_->Send(new QuotaHostMsg_RequestStorageQuota(
       render_view_id, request_id, origin_url, type, requested_size));
 }