web-threads: Create a single instance of WebThread for each blink thread.

content/child/blink_platform_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_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/threading/thread_local_storage.h"
 #include "base/timer/timer.h"
@@ skipping 150 matching lines @@
   void SuspendSharedTimer();
   void ResumeSharedTimer();
   virtual void OnStartSharedTimer(base::TimeDelta delay) {}
 
   WebBluetoothImpl* BluetoothImplForTesting() { return bluetooth_.get(); }
 
   virtual blink::WebString domCodeStringFromEnum(int dom_code);
   virtual int domEnumFromCodeString(const blink::WebString& codeString);
 
  private:
-  static void DestroyCurrentThread(void*);
-
   void DoTimeout() {
     if (shared_timer_func_ && !shared_timer_suspended_)
       shared_timer_func_();
   }
 
   void InternalInit();
+  void UpdateWebThreadTLS(blink::WebThread* thread);
 
   scoped_refptr<base::SingleThreadTaskRunner> MainTaskRunnerForCurrentThread();
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   WebThemeEngineImpl native_theme_engine_;
   WebFallbackThemeEngineImpl fallback_theme_engine_;
   base::OneShotTimer<BlinkPlatformImpl> shared_timer_;
   void (*shared_timer_func_)();
   double shared_timer_fire_time_;
   bool shared_timer_fire_time_was_set_while_suspended_;
   int shared_timer_suspended_;  // counter
   base::ThreadLocalStorage::Slot current_thread_slot_;
   WebCryptoImpl web_crypto_;
   scoped_ptr<WebGeofencingProviderImpl> geofencing_provider_;
   scoped_ptr<WebBluetoothImpl> bluetooth_;
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
   scoped_refptr<PushDispatcher> push_dispatcher_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_