cc: Gather and lock/unlock SkDiscardablePixelRefs instead of skia::LazyPixelRefs.

cc/resources/picture_pile_impl_unittest.cc

 // Copyright 2013 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 "base/memory/scoped_ptr.h"
 #include "cc/test/fake_picture_pile_impl.h"
 #include "cc/test/fake_rendering_stats_instrumentation.h"
 #include "cc/test/skia_common.h"
-#include "skia/ext/lazy_pixel_ref.h"
 #include "skia/ext/refptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkPixelRef.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
 namespace {
 
@@ skipping 719 matching lines @@
 
   SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
   int num_pixels = bitmap.width() * bitmap.height();
   for (int i = 0; i < num_pixels; ++i) {
     EXPECT_EQ(SkColorGetA(pixels[i]), 0u);
   }
 }
 
 }  // namespace
 }  // namespace cc