cc: Move pre-decodes to background worker.

cc/paint/draw_image.cc

 // Copyright 2015 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/paint/draw_image.h"
 
 namespace cc {
 namespace {
 
 // Helper funciton to extract a scale from the matrix. Returns true on success
@@ skipping 28 matching lines @@
       filter_quality_(filter_quality),
       matrix_(matrix),
       target_color_space_(target_color_space) {
   matrix_is_decomposable_ = ExtractScale(matrix_, &scale_);
 }
 
 DrawImage::DrawImage(const DrawImage& other) = default;
 
 DrawImage::~DrawImage() = default;
 
+bool DrawImage::operator==(const DrawImage& other) const {
+  return paint_image_ == other.paint_image_ && src_rect_ == other.src_rect_ &&
+         filter_quality_ == other.filter_quality_ && matrix_ == other.matrix_ &&
+         scale_ == other.scale_ &&
+         matrix_is_decomposable_ == other.matrix_is_decomposable_ &&
+         target_color_space_ == other.target_color_space_;
+}
+
 }  // namespace cc