Raster display item lists via a visual rect RTree.

cc/playback/raster_source.cc

Index: cc/playback/raster_source.cc
diff --git a/cc/playback/raster_source.cc b/cc/playback/raster_source.cc
index 292d92512f134ed6054ae4d1664256b0c82f56fd..bdb5a135975906df7a370f185bab59ac9698aa20 100644
--- a/cc/playback/raster_source.cc
+++ b/cc/playback/raster_source.cc
@@ -197,11 +197,9 @@ void RasterSource::RasterCommon(SkCanvas* canvas,
   canvas->clipRect(gfx::RectToSkRect(content_rect), SkRegion::kIntersect_Op);
 
   DCHECK(display_list_.get());
-  gfx::Rect canvas_target_playback_rect =
-      canvas_playback_rect - canvas_bitmap_rect.OffsetFromOrigin();
   int repeat_count = std::max(1, slow_down_raster_scale_factor_for_debug_);
   for (int i = 0; i < repeat_count; ++i) {
-    display_list_->Raster(canvas, callback, canvas_target_playback_rect,
+    display_list_->Raster(canvas, callback, canvas_playback_rect,
                           contents_scale);
   }
 }