Add WorkerThread based methods for start/stop of worker threads.

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"
 #include "base/threading/thread.h"
+#include "base/timer/timer.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebThread.h"
 
 namespace content {
 
 class CONTENT_EXPORT WebThreadBase : public blink::WebThread {
  public:
   virtual ~WebThreadBase();
 
   virtual void addTaskObserver(TaskObserver* observer);
   virtual void removeTaskObserver(TaskObserver* observer);
 
   virtual bool isCurrentThread() const = 0;
 
+  typedef void (*SharedTimerFunction)();
+  virtual void setSharedTimerFiredFunction(SharedTimerFunction timerFunction) {}

[jochen (gone - plz use gerrit), 2014/07/17 09:48:03]

why not = 0?

[nasko, 2014/07/17 10:49:32]

If I make them pure virtual, then I have to provide implementations in
WebThreadImplForMessageLoop. I just opted not to touch that class, as it doesn't
change itself.

+  virtual void setSharedTimerFireInterval(double) {}
+  virtual void stopSharedTimer() {}
+
  protected:
   WebThreadBase();
 
  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(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 OVERRIDE;
 
+  virtual void setSharedTimerFiredFunction(SharedTimerFunction timerFunction);
+  virtual void setSharedTimerFireInterval(double interval_seconds);
+  virtual void stopSharedTimer();
+
  private:
+  void OnTimeout() {
+    if (shared_timer_function_)
+      shared_timer_function_();
+  }
+  base::OneShotTimer<WebThreadImpl> shared_timer_;
+  SharedTimerFunction shared_timer_function_;
+
   scoped_ptr<base::Thread> thread_;
 };
 
 class WebThreadImplForMessageLoop : public WebThreadBase {
  public:
   CONTENT_EXPORT explicit WebThreadImplForMessageLoop(
       base::MessageLoopProxy* message_loop);
   CONTENT_EXPORT virtual ~WebThreadImplForMessageLoop();
 
   virtual void postTask(Task* task) OVERRIDE;
   virtual void postDelayedTask(Task* task, long long delay_ms) OVERRIDE;
 
   virtual void enterRunLoop() OVERRIDE;
   virtual void exitRunLoop() OVERRIDE;
 
  private:
   virtual bool isCurrentThread() const OVERRIDE;
   scoped_refptr<base::MessageLoopProxy> message_loop_;
 };
 
 } // namespace content
 
 #endif  // CONTENT_CHILD_WEBTHREAD_IMPL_H_