Expose platform thread id on blink::WebThread

mojo/services/html_viewer/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 MOJO_SERVICES_HTML_VIEWER_WEBTHREAD_IMPL_H_
 #define MOJO_SERVICES_HTML_VIEWER_WEBTHREAD_IMPL_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread.h"
 #include "third_party/WebKit/public/platform/WebThread.h"
 
 namespace mojo {
 
 class WebThreadBase : public blink::WebThread {
  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:
   WebThreadBase();
 
  private:
   class TaskObserverAdapter;
 
   typedef std::map<TaskObserver*, TaskObserverAdapter*> TaskObserverMap;
   TaskObserverMap task_observer_map_;
 };
 
 class WebThreadImpl : public WebThreadBase {
  public:
   explicit WebThreadImpl(const char* name);
   virtual ~WebThreadImpl();
 
   virtual void postTask(Task* task);
   virtual void postDelayedTask(Task* task, long long delay_ms);
 
   virtual void enterRunLoop();
   virtual void exitRunLoop();
 
   base::MessageLoop* message_loop() const { return thread_->message_loop(); }
 
   virtual bool isCurrentThread() const;
+  virtual blink::PlatformThreadId threadId() const;
 
  private:
   scoped_ptr<base::Thread> thread_;
 };
 
 class WebThreadImplForMessageLoop : public WebThreadBase {
  public:
   explicit WebThreadImplForMessageLoop(
       base::MessageLoopProxy* message_loop);
   virtual ~WebThreadImplForMessageLoop();
 
   virtual void postTask(Task* task);
   virtual void postDelayedTask(Task* task, long long delay_ms);
 
   virtual void enterRunLoop();
   virtual void exitRunLoop();
 
  private:
   virtual bool isCurrentThread() const;
+  virtual blink::PlatformThreadId threadId() const;
+
   scoped_refptr<base::MessageLoopProxy> message_loop_;
+  blink::PlatformThreadId thread_id_;
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_HTML_VIEWER_WEBTHREAD_IMPL_H_