GTTF: Add missing virtual destructors.

cc/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_RATE_LIMITER_H_
 #define CC_RATE_LIMITER_H_
 
 #include "base/memory/ref_counted.h"
 
 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*, RateLimiterClient*, Thread*);
 
@@ skipping 12 matching lines @@
     void rateLimitContext();
 
     WebKit::WebGraphicsContext3D* m_context;
     bool m_active;
     RateLimiterClient *m_client;
     Thread* m_thread;
 };
 
 }
 #endif  // CC_RATE_LIMITER_H_