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diff --git a/chromium/cc/scheduler/rate_limiter.h b/chromium/cc/scheduler/rate_limiter.h
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+++ b/chromium/cc/scheduler/rate_limiter.h
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+// 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 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,
+      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,
+              base::SingleThreadTaskRunner* task_runner);
+  ~RateLimiter();
+
+  void RateLimitContext();
+
+  WebKit::WebGraphicsContext3D* context_;
+  bool active_;
+  RateLimiterClient* client_;
+  base::SingleThreadTaskRunner* task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(RateLimiter);
+};
+
+}  // namespace cc
+
+#endif  // CC_SCHEDULER_RATE_LIMITER_H_