Make new TaskRunner, SequencedTaskRunner, and SingleThreadTaskRunner interfaces

content/browser/browser_thread_impl.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 "content/browser/browser_thread_impl.h"
 
 #include "base/atomicops.h"
 #include "base/bind.h"
+#include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace content {
 
 namespace {
 
@@ skipping 158 matching lines @@
 // An implementation of MessageLoopProxy to be used in conjunction
 // with BrowserThread.
 class BrowserThreadMessageLoopProxy : public base::MessageLoopProxy {
  public:
   explicit BrowserThreadMessageLoopProxy(BrowserThread::ID identifier)
       : id_(identifier) {
   }
 
   // MessageLoopProxy implementation.
   virtual bool PostTask(const tracked_objects::Location& from_here,
-                        const base::Closure& task) {
+                        const base::Closure& task) OVERRIDE {
     return BrowserThread::PostTask(id_, from_here, task);
   }
 
-  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const base::Closure& task, int64 delay_ms) {
+  virtual bool PostDelayedTask(
+      const tracked_objects::Location& from_here,
+      const base::Closure& task, int64 delay_ms) OVERRIDE{
     return BrowserThread::PostDelayedTask(id_, from_here, task, delay_ms);
   }
 
   virtual bool PostNonNestableTask(const tracked_objects::Location& from_here,
-                                   const base::Closure& task) {
+                                   const base::Closure& task) OVERRIDE {
     return BrowserThread::PostNonNestableTask(id_, from_here, task);
   }
 
   virtual bool PostNonNestableDelayedTask(
       const tracked_objects::Location& from_here,
       const base::Closure& task,
-      int64 delay_ms) {
+      int64 delay_ms) OVERRIDE {
     return BrowserThread::PostNonNestableDelayedTask(id_, from_here, task,
                                                      delay_ms);
   }
 
-  virtual bool BelongsToCurrentThread() {
+  virtual bool BelongsToCurrentThread() const OVERRIDE {
     return BrowserThread::CurrentlyOn(id_);
   }
 
  private:
   BrowserThread::ID id_;
   DISALLOW_COPY_AND_ASSIGN(BrowserThreadMessageLoopProxy);
 };
 
 // static
 bool BrowserThread::PostBlockingPoolTask(
@@ skipping 141 matching lines @@
   AtomicWord* storage = reinterpret_cast<AtomicWord*>(
       &globals.thread_delegates[identifier]);
   AtomicWord old_pointer = base::subtle::NoBarrier_AtomicExchange(
       storage, reinterpret_cast<AtomicWord>(delegate));
 
   // This catches registration when previously registered.
   DCHECK(!delegate || !old_pointer);
 }
 
 }  // namespace content