Adaptively throttle texture uploads

cc/UnthrottledTextureUploader.h

 // Copyright 2012 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 UnthrottledTextureUploader_h
 #define UnthrottledTextureUploader_h
 
 #include "CCResourceProvider.h"
 #include "TextureUploader.h"
 
 namespace WebCore {
 
 class UnthrottledTextureUploader : public TextureUploader {
     WTF_MAKE_NONCOPYABLE(UnthrottledTextureUploader);
 public:
     static PassOwnPtr<UnthrottledTextureUploader> create()
     {
         return adoptPtr(new UnthrottledTextureUploader());
     }
     virtual ~UnthrottledTextureUploader() { }
 
     virtual bool isBusy() OVERRIDE { return false; }
+    virtual double estimatedPixelsPerSecond() { return std::numeric_limits<double>::max(); }
     virtual void beginUploads() OVERRIDE { }
     virtual void endUploads() OVERRIDE { }
     virtual void uploadTexture(CCResourceProvider* resourceProvider, Parameters upload) OVERRIDE { upload.texture->updateRect(resourceProvider, upload.sourceRect, upload.destOffset); }
 
 protected:
     UnthrottledTextureUploader() { }
 };
 
 }
 
 #endif