cc: Add LayerTreeSetting to disable cached picture raster.

cc/layers/picture_image_layer.cc

 // Copyright 2010 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 <stddef.h>
 
 #include "cc/layers/picture_image_layer_impl.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "cc/playback/drawing_display_item.h"
+#include "cc/trees/layer_tree_host.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 scoped_refptr<PictureImageLayer> PictureImageLayer::Create() {
   return make_scoped_refptr(new PictureImageLayer());
 }
@@ skipping 28 matching lines @@
 
 gfx::Rect PictureImageLayer::PaintableRegion() {
   return gfx::Rect(bounds());
 }
 
 scoped_refptr<DisplayItemList> PictureImageLayer::PaintContentsToDisplayList(
     ContentLayerClient::PaintingControlSetting painting_control) {
   DCHECK(image_);
   DCHECK_GT(image_->width(), 0);
   DCHECK_GT(image_->height(), 0);
+  DCHECK(layer_tree_host());
 
-  // Picture image layers can be used with GatherPixelRefs, so cached SkPictures
-  // are currently required.
   DisplayItemListSettings settings;
-  settings.use_cached_picture = true;
+  settings.use_cached_picture =
+      layer_tree_host()->settings().use_cached_picture_raster;
   scoped_refptr<DisplayItemList> display_list =
       DisplayItemList::Create(PaintableRegion(), settings);
 
   SkPictureRecorder recorder;
   SkCanvas* canvas =
       recorder.beginRecording(gfx::RectToSkRect(PaintableRegion()));
 
   SkScalar content_to_layer_scale_x =
       SkFloatToScalar(static_cast<float>(bounds().width()) / image_->width());
   SkScalar content_to_layer_scale_y =
@@ skipping 14 matching lines @@
 
 bool PictureImageLayer::FillsBoundsCompletely() const {
   return false;
 }
 
 size_t PictureImageLayer::GetApproximateUnsharedMemoryUsage() const {
   return 0;
 }
 
 }  // namespace cc