Perform glReadPixels with PBOs in the gpu, if PBOs are available.

cc/test/test_web_graphics_context_3d.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_TEST_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 #define CC_TEST_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 92 matching lines @@
 
   virtual void setContextLostCallback(
       WebGraphicsContextLostCallback* callback);
 
   virtual void loseContextCHROMIUM(WebKit::WGC3Denum current,
                                    WebKit::WGC3Denum other);
 
   // Takes ownership of the |callback|.
   virtual void signalSyncPoint(unsigned sync_point,
                                WebGraphicsSyncPointCallback* callback);
+  virtual void signalQuery(WebKit::WebGLId query,
+                           WebGraphicsSyncPointCallback* callback);
 
   virtual void setSwapBuffersCompleteCallbackCHROMIUM(
       WebGraphicsSwapBuffersCompleteCallbackCHROMIUM* callback);
 
   virtual void setMemoryAllocationChangedCallbackCHROMIUM(
       WebGraphicsMemoryAllocationChangedCallbackCHROMIUM* callback);
 
   virtual void prepareTexture();
   virtual void finish();
   virtual void flush();
@@ skipping 133 matching lines @@
    private:
     DISALLOW_COPY_AND_ASSIGN(Image);
   };
   ScopedPtrHashMap<unsigned, Image> images_;
   base::WeakPtrFactory<TestWebGraphicsContext3D> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_WEB_GRAPHICS_CONTEXT_3D_H_