cc: Change RTree::Search to return results, add comments, more tests.

cc/paint/display_item_list.cc

 // Copyright 2014 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/paint/display_item_list.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 196 matching lines @@
   op->RasterWithAlpha(canvas, save_item.alpha);
   return true;
 }
 
 void DisplayItemList::Raster(SkCanvas* canvas,
                              SkPicture::AbortCallback* callback) const {
   gfx::Rect canvas_playback_rect;
   if (!GetCanvasClipBounds(canvas, &canvas_playback_rect))
     return;
 
-  std::vector<size_t> indices;
-  rtree_.Search(canvas_playback_rect, &indices);
+  std::vector<size_t> indices = rtree_.Search(canvas_playback_rect);
   for (size_t i = 0; i < indices.size(); ++i) {
     // We use a callback during solid color analysis on the compositor thread to
     // break out early. Since we're handling a sequence of pictures via rtree
     // query results ourselves, we have to respect the callback and early out.
     if (callback && callback->abort())
       break;
 
     const DisplayItem& item = items_[indices[i]];
     // Optimize empty begin/end compositing and merge begin/draw/end compositing
     // where possible.
@@ skipping 329 matching lines @@
     std::vector<DrawImage>* images) {
   image_map_.GetDiscardableImagesInRect(rect, contents_scale,
                                         target_color_space, images);
 }
 
 gfx::Rect DisplayItemList::GetRectForImage(ImageId image_id) const {
   return image_map_.GetRectForImage(image_id);
 }
 
 }  // namespace cc