Reduce texture uploads during scrollbar invalidations.

cc/LayerTextureUpdater.cpp

 // 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.
 
 #include "config.h"
 
 #include "LayerTextureUpdater.h"
 
 namespace cc {
 
 LayerTextureUpdater::Texture::Texture(PassOwnPtr<CCPrioritizedTexture> texture)
     : m_texture(texture)
 {
 }
 
 LayerTextureUpdater::Texture::~Texture()
 {
 }
 
 bool LayerTextureUpdater::Texture::backingResourceWasEvicted() const
 {
     return m_texture->backingResourceWasEvicted();
 }
 
+bool LayerTextureUpdater::pixelsDidChange() const
+{
+    // Be conservative by always saying pixels changed.
+    return true;
 }
+
+}