NOT FOR REVIEW - prioritize fonts

content/renderer/renderer_high_priority_task_queue.cc

+// 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.
+
+#include "base/lazy_instance.h"
+#include "base/message_loop/message_loop_proxy_impl.h"
+#include "base/time/time.h"
+#include "base/threading/thread_restrictions.h"
+#include "content/renderer/renderer_high_priority_task_queue.h"
+
+#include <stdio.h>
+
+namespace content {
+class RendererHighPriorityTaskQueueImpl {
+public:
+  RendererHighPriorityTaskQueueImpl();
+  ~RendererHighPriorityTaskQueueImpl();
+
+  void Init(scoped_refptr<base::MessageLoopProxy> proxy);
+  bool PostTask(const tracked_objects::Location& from_here,
+                const base::Closure& task);
+
+private:
+  scoped_refptr<base::MessageLoopProxy> high_priority_message_loop_proxy_;
+};
+
+namespace {
+base::LazyInstance<RendererHighPriorityTaskQueueImpl>::Leaky g_lazy_instance;
+}  // namespace
+
+
+MessageLoopRendererMainThread::MessageLoopRendererMainThread() {
+  high_priority_incoming_task_queue_ =
+      new base::internal::IncomingTaskQueue(this);
+  high_priority_message_loop_proxy_ =
+      new base::internal::MessageLoopProxyImpl(
+          high_priority_incoming_task_queue_);
+  g_lazy_instance.Get().Init(high_priority_message_loop_proxy_);
+}
+
+void MessageLoopRendererMainThread::ReloadHighPriorityWorkQueue() {
+  if (high_priority_work_queue_.empty())
+    high_priority_incoming_task_queue_->ReloadWorkQueue(
+        &high_priority_work_queue_);
+}
+
+void MessageLoopRendererMainThread::ReloadAllWorkQueues() {
+  MessageLoop::ReloadAllWorkQueues();
+  ReloadHighPriorityWorkQueue();
+}
+
+base::TaskQueue& MessageLoopRendererMainThread::GetNextWorkQueue() {
+  base::TaskQueue& current_task_queue = !high_priority_work_queue_.empty() ?
+      high_priority_work_queue_ : MessageLoop::GetNextWorkQueue();
+  return current_task_queue;
+}
+
+bool MessageLoopRendererMainThread::HasWorkAvailable() const {
+  return !high_priority_work_queue_.empty() || MessageLoop::HasWorkAvailable();
+}
+
+
+RendererHighPriorityTaskQueueImpl::RendererHighPriorityTaskQueueImpl() {
+}
+
+RendererHighPriorityTaskQueueImpl::~RendererHighPriorityTaskQueueImpl() {
+}
+
+void RendererHighPriorityTaskQueueImpl::Init(
+    scoped_refptr<base::MessageLoopProxy> proxy) {
+  high_priority_message_loop_proxy_ = proxy;
+}
+
+bool RendererHighPriorityTaskQueueImpl::PostTask(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task) {
+  return high_priority_message_loop_proxy_->PostTask(from_here, task);
+}
+
+// static
+bool RendererHighPriorityTaskQueue::PostTask(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task) {
+  return g_lazy_instance.Get().PostTask(from_here, task);
+}
+
+}  // namespace content