cc: Make DisplayItemList::Append replay into an SkPicture

cc/layers/picture_image_layer_unittest.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/layers/picture_image_layer.h"
 
 #include "cc/resources/display_item.h"
 #include "cc/test/skia_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 15 matching lines @@
   SkCanvas image_canvas(image_bitmap);
   image_canvas.clear(SK_ColorRED);
   SkPaint blue_paint;
   blue_paint.setColor(SK_ColorBLUE);
   image_canvas.drawRectCoords(0.f, 0.f, 100.f, 100.f, blue_paint);
   image_canvas.drawRectCoords(100.f, 100.f, 200.f, 200.f, blue_paint);
 
   layer->SetBitmap(image_bitmap);
   layer->SetBounds(gfx::Size(layer_rect.width(), layer_rect.height()));
 
+  bool use_cached_picture = false;

[enne (OOO), 2015/04/15 16:43:19]

Maybe this test should test both cached and not cached?

[ajuma, 2015/04/15 17:24:36]

Done.

   scoped_refptr<DisplayItemList> display_list =
-      layer->PaintContentsToDisplayList(
-          layer_rect, ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
+      DisplayItemList::Create(layer_rect, use_cached_picture);
+  layer->PaintContentsToDisplayList(
+      display_list.get(), layer_rect,
+      ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
   unsigned char actual_pixels[4 * 200 * 200] = {0};
   DrawDisplayList(actual_pixels, layer_rect, display_list);
 
   EXPECT_EQ(0, memcmp(actual_pixels, image_pixels, 4 * 200 * 200));
 }
 
 }  // namespace
 }  // namespace cc