[cc] Add nearest neighbor filtering for PictureLayer.

cc/layers/picture_layer.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/layers/picture_layer.h"
 
 #include "base/auto_reset.h"
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/resources/display_list_recording_source.h"
 #include "cc/resources/picture_pile.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
 namespace cc {
 
 scoped_refptr<PictureLayer> PictureLayer::Create(ContentLayerClient* client) {
   return make_scoped_refptr(new PictureLayer(client));
 }
 
 PictureLayer::PictureLayer(ContentLayerClient* client)
     : client_(client),
       instrumentation_object_tracker_(id()),
       update_source_frame_number_(-1),
       can_use_lcd_text_for_update_(true),
-      is_mask_(false) {
+      is_mask_(false),
+      nearest_neighbor_(false) {
 }
 
 PictureLayer::PictureLayer(ContentLayerClient* client,
                            scoped_ptr<RecordingSource> source)
     : PictureLayer(client) {
   recording_source_ = source.Pass();
 }
 
 PictureLayer::~PictureLayer() {
 }
@@ skipping 20 matching lines @@
       << recording_source_bounds.ToString();
 
   if (update_source_frame_number_ != source_frame_number &&
       recording_source_bounds != impl_bounds) {
     // Update may not get called for the layer (if it's not in the viewport
     // for example, even though it has resized making the recording source no
     // longer valid. In this case just destroy the recording source.
     recording_source_->SetEmptyBounds();
   }
 
+  layer_impl->SetNearestNeighbor(nearest_neighbor_);
+
   scoped_refptr<RasterSource> raster_source =
       recording_source_->CreateRasterSource();
   raster_source->SetBackgoundColor(SafeOpaqueBackgroundColor());
   raster_source->SetRequiresClear(!contents_opaque() &&
                                   !client_->FillsBoundsCompletely());
   layer_impl->UpdateRasterSource(raster_source, &recording_invalidation_,
                                  nullptr);
   DCHECK(recording_invalidation_.IsEmpty());
 }
 
@@ skipping 120 matching lines @@
 
 bool PictureLayer::IsSuitableForGpuRasterization() const {
   return recording_source_->IsSuitableForGpuRasterization();
 }
 
 void PictureLayer::ClearClient() {
   client_ = nullptr;
   UpdateDrawsContent(HasDrawableContent());
 }
 
+void PictureLayer::SetNearestNeighbor(bool nearest_neighbor) {
+  if (nearest_neighbor_ == nearest_neighbor)
+    return;
+
+  nearest_neighbor_ = nearest_neighbor;
+  SetNeedsCommit();
+}
+
 bool PictureLayer::HasDrawableContent() const {
   return client_ && Layer::HasDrawableContent();
 }
 
 void PictureLayer::RunMicroBenchmark(MicroBenchmark* benchmark) {
   benchmark->RunOnLayer(this);
 }
 
 }  // namespace cc