Raster display item lists via a visual rect RTree.

cc/test/fake_display_list_raster_source.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/test/fake_display_list_raster_source.h"
 
 #include <limits>
 
 #include "base/synchronization/waitable_event.h"
 #include "cc/test/fake_display_list_recording_source.h"
@@ skipping 11 matching lines @@
 
 scoped_refptr<FakeDisplayListRasterSource>
 FakeDisplayListRasterSource::CreateFilled(const gfx::Size& size) {
   auto recording_source =
       FakeDisplayListRecordingSource::CreateFilledRecordingSource(size);
 
   SkPaint red_paint;
   red_paint.setColor(SK_ColorRED);
   recording_source->add_draw_rect_with_paint(gfx::Rect(size), red_paint);
 
+  // TODO(wkorman): enne@ has various changes here that look like they're just
+  // hacks to test specific performance items. Omitting for now. See
+  // http://crrev.com/1459003003 for detail.
+
   gfx::Size smaller_size(size.width() - 10, size.height() - 10);
   SkPaint green_paint;
   green_paint.setColor(SK_ColorGREEN);
   recording_source->add_draw_rect_with_paint(gfx::Rect(smaller_size),
                                              green_paint);
 
   recording_source->Rerecord();
 
   return make_scoped_refptr(
       new FakeDisplayListRasterSource(recording_source.get(), false));
@@ skipping 107 matching lines @@
     const gfx::Rect& canvas_bitmap_rect,
     const gfx::Rect& canvas_playback_rect,
     float contents_scale) const {
   if (playback_allowed_event_)
     playback_allowed_event_->Wait();
   DisplayListRasterSource::PlaybackToCanvas(
       canvas, canvas_bitmap_rect, canvas_playback_rect, contents_scale);
 }
 
 }  // namespace cc