[cc] Cleanup: remove unused class - CachingBitmapContentLayerUpdater

cc/resources/caching_bitmap_content_layer_updater.cc

-// 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 "cc/resources/caching_bitmap_content_layer_updater.h"
-
-#include "base/logging.h"
-#include "cc/resources/layer_painter.h"
-#include "skia/ext/platform_canvas.h"
-
-namespace cc {
-
-scoped_refptr<CachingBitmapContentLayerUpdater>
-CachingBitmapContentLayerUpdater::Create(
-    scoped_ptr<LayerPainter> painter,
-    RenderingStatsInstrumentation* stats_instrumentation,
-    int layer_id) {
-  return make_scoped_refptr(
-      new CachingBitmapContentLayerUpdater(painter.Pass(),
-                                           stats_instrumentation,
-                                           layer_id));
-}
-
-CachingBitmapContentLayerUpdater::CachingBitmapContentLayerUpdater(
-    scoped_ptr<LayerPainter> painter,
-    RenderingStatsInstrumentation* stats_instrumentation,
-    int layer_id)
-    : BitmapContentLayerUpdater(painter.Pass(),
-                                stats_instrumentation,
-                                layer_id),
-      pixels_did_change_(false) {}
-
-CachingBitmapContentLayerUpdater::~CachingBitmapContentLayerUpdater() {}
-
-void CachingBitmapContentLayerUpdater::PrepareToUpdate(
-    gfx::Rect content_rect,
-    gfx::Size tile_size,
-    float contents_width_scale,
-    float contents_height_scale,
-    gfx::Rect* resulting_opaque_rect) {
-  BitmapContentLayerUpdater::PrepareToUpdate(content_rect,
-                                             tile_size,
-                                             contents_width_scale,
-                                             contents_height_scale,
-                                             resulting_opaque_rect);
-
-  const SkBitmap& new_bitmap = canvas_->getDevice()->accessBitmap(false);
-  SkAutoLockPixels lock(new_bitmap);
-  DCHECK_GT(new_bitmap.bytesPerPixel(), 0);
-  pixels_did_change_ = new_bitmap.config() != cached_bitmap_.config() ||
-                       new_bitmap.height() != cached_bitmap_.height() ||
-                       new_bitmap.width() != cached_bitmap_.width() ||
-                       memcmp(new_bitmap.getPixels(),
-                              cached_bitmap_.getPixels(),
-                              new_bitmap.getSafeSize());
-
-  if (pixels_did_change_)
-    new_bitmap.deepCopyTo(&cached_bitmap_, new_bitmap.config());
-}
-
-}  // namespace cc