cc: Remove cc::Thread and cc::ThreadImpl.

cc/scheduler/rate_limiter.h

 // Copyright 2011 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 CC_SCHEDULER_RATE_LIMITER_H_
 #define CC_SCHEDULER_RATE_LIMITER_H_
 
 #include "base/memory/ref_counted.h"
 
+namespace base { class SingleThreadTaskRunner; }
+
 namespace WebKit { class WebGraphicsContext3D; }
 
 namespace cc {
 
-class Thread;
-
 class RateLimiterClient {
  public:
   virtual void RateLimit() = 0;
 
  protected:
   virtual ~RateLimiterClient() {}
 };
 
 // A RateLimiter can be used to make sure that a single context does not
 // dominate all execution time.  To use, construct a RateLimiter class around
 // the context and call Start() whenever calls are made on the context outside
 // of normal flow control. RateLimiter will block if the context is too far
 // ahead of the compositor.
 class RateLimiter : public base::RefCounted<RateLimiter> {
  public:
   static scoped_refptr<RateLimiter> Create(
       WebKit::WebGraphicsContext3D* context,
       RateLimiterClient* client,
-      Thread* thread);
+      base::SingleThreadTaskRunner* task_runner);
 
   void Start();
 
   // Context and client will not be accessed after Stop().
   void Stop();
 
  private:
   friend class base::RefCounted<RateLimiter>;
 
   RateLimiter(WebKit::WebGraphicsContext3D* context,
               RateLimiterClient* client,
-              Thread* thread);
+              base::SingleThreadTaskRunner* task_runner);
   ~RateLimiter();
 
   void RateLimitContext();
 
   WebKit::WebGraphicsContext3D* context_;
   bool active_;
   RateLimiterClient* client_;
-  Thread* thread_;
+  base::SingleThreadTaskRunner* task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(RateLimiter);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_RATE_LIMITER_H_