cc: Add LayerTreeSetting to disable cached picture raster.

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/playback/display_item.h"
+#include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/skia_common.h"
+#include "cc/test/test_task_graph_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
 namespace cc {
 namespace {
 
 TEST(PictureImageLayerTest, PaintContentsToDisplayList) {
   scoped_refptr<PictureImageLayer> layer = PictureImageLayer::Create();
+  FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);
+  TestTaskGraphRunner task_graph_runner;
+  scoped_ptr<FakeLayerTreeHost> host =
+      FakeLayerTreeHost::Create(&client, &task_graph_runner);
+  layer->SetLayerTreeHost(host.get());
   gfx::Rect layer_rect(200, 200);
 
   unsigned char image_pixels[4 * 200 * 200] = {0};
   SkImageInfo info =
       SkImageInfo::MakeN32Premul(layer_rect.width(), layer_rect.height());
   skia::RefPtr<SkSurface> image_surface = skia::AdoptRef(
       SkSurface::NewRasterDirect(info, image_pixels, info.minRowBytes()));
   SkCanvas* image_canvas = image_surface->getCanvas();
   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);
 
   skia::RefPtr<const SkImage> image =
       skia::AdoptRef(image_surface->newImageSnapshot());
   layer->SetImage(std::move(image));
   layer->SetBounds(gfx::Size(layer_rect.width(), layer_rect.height()));
 
   scoped_refptr<DisplayItemList> display_list =
       layer->PaintContentsToDisplayList(
           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));
+
+  layer->SetLayerTreeHost(nullptr);

[vmpstr, 2016/03/29 18:46:05]

Do you need this? If not, then please remove. 

[Khushal, 2016/03/29 18:57:52]

The Layer must be detached from its host during teardown. There is a DCHECK to
asset that in the destructor.

 }
 
 }  // namespace
 }  // namespace cc