cc: Do GatherPixelRefs from skia at record time

cc/base/util.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 CC_BASE_UTIL_H_
 #define CC_BASE_UTIL_H_
 
 namespace cc {
 
 template <typename T> T RoundUp(T n, T mul) {
   return ((n + mul - 1) / mul) * mul;
 }
 
+template <typename T> T RoundDown(T value, T multiple) {

[reveman, 2013/04/24 14:10:52]

nit: make the parameter names consistent with RoundUp

[vmpstr, 2013/04/24 21:11:10]

Done.

+  return (value < 0) ? ((value - multiple + 1) / multiple) * multiple
+                     : (value / multiple) * multiple;

[reveman, 2013/04/24 14:10:52]

RoundUp doesn't seem to handle negative numbers correctly so it's inconsistent
that RoundDown does. I think you should fix RoundUp too if you need this.

[vmpstr, 2013/04/24 21:11:10]

Done. I also checked and the current uses of RoundUp only deal with positive
numbers, so this doesn't affect existing code.

+}
+
 }  // namespace cc
 
 #endif  // CC_BASE_UTIL_H_