scheduler: Implement task observers

content/child/webthread_impl.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_CHILD_WEBTHREAD_IMPL_H_
 #define CONTENT_CHILD_WEBTHREAD_IMPL_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 11 matching lines @@
  public:
   virtual ~WebThreadBase();
 
   virtual void addTaskObserver(TaskObserver* observer);
   virtual void removeTaskObserver(TaskObserver* observer);
 
   virtual bool isCurrentThread() const = 0;
   virtual blink::PlatformThreadId threadId() const = 0;
 
  protected:
+  class TaskObserverAdapter;
+
   WebThreadBase();
 
+  virtual void AddTaskObserverInternal(
+      base::MessageLoop::TaskObserver* observer);
+  virtual void RemoveTaskObserverInternal(
+      base::MessageLoop::TaskObserver* observer);
+
+  static void RunWebThreadTask(scoped_ptr<blink::WebThread::Task> task);
+
  private:
-  class TaskObserverAdapter;
-
   typedef std::map<TaskObserver*, TaskObserverAdapter*> TaskObserverMap;
   TaskObserverMap task_observer_map_;
 };
 
 class CONTENT_EXPORT WebThreadImpl : public WebThreadBase {
  public:
   explicit WebThreadImpl(const char* name);
   virtual ~WebThreadImpl();
 
   virtual void postTask(const blink::WebTraceLocation& location, Task* task);
@@ skipping 39 matching lines @@
   virtual bool isCurrentThread() const override;
   virtual blink::PlatformThreadId threadId() const override;
 
   scoped_refptr<base::SingleThreadTaskRunner> owning_thread_task_runner_;
   blink::PlatformThreadId thread_id_;
 };
 
 } // namespace content
 
 #endif  // CONTENT_CHILD_WEBTHREAD_IMPL_H_