SkBitmap and SkPixelRef no longer need lock/unlock

ui/gfx/color_utils.cc

 // Copyright (c) 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 "ui/gfx/color_utils.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 218 matching lines @@
   }
   return SkColorSetARGB(alpha,
                         static_cast<int>(std::round(r)),
                         static_cast<int>(std::round(g)),
                         static_cast<int>(std::round(b)));
 }
 
 void BuildLumaHistogram(const SkBitmap& bitmap, int histogram[256]) {
   DCHECK_EQ(kN32_SkColorType, bitmap.colorType());
 
-  SkAutoLockPixels bitmap_lock(bitmap);
-
   int pixel_width = bitmap.width();
   int pixel_height = bitmap.height();
   for (int y = 0; y < pixel_height; ++y) {
     for (int x = 0; x < pixel_width; ++x)
       ++histogram[GetLuma(bitmap.getColor(x, y))];
   }
 }
 
 double CalculateBoringScore(const SkBitmap& bitmap) {
   if (bitmap.isNull() || bitmap.empty())
@@ skipping 105 matching lines @@
       "rgba(%s,%s)", SkColorToRgbString(color).c_str(),
       base::DoubleToString(SkColorGetA(color) / 255.0).c_str());
 }
 
 std::string SkColorToRgbString(SkColor color) {
   return base::StringPrintf("%d,%d,%d", SkColorGetR(color), SkColorGetG(color),
                             SkColorGetB(color));
 }
 
 }  // namespace color_utils