cc: Cull DrawingDisplayItems outside of the raster playback rect

cc/playback/display_list_raster_source.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/playback/display_list_raster_source.h"
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/region.h"
 #include "cc/debug/debug_colors.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 96 matching lines @@
     const gfx::Rect& canvas_playback_rect,
     float contents_scale) const {
   canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y());
   gfx::Rect content_rect =
       gfx::ToEnclosingRect(gfx::ScaleRect(gfx::Rect(size_), contents_scale));
   content_rect.Intersect(canvas_playback_rect);
 
   canvas->clipRect(gfx::RectToSkRect(content_rect), SkRegion::kIntersect_Op);
 
   DCHECK(display_list_.get());
-  display_list_->Raster(canvas, callback, contents_scale);
+  gfx::Rect canvas_target_playback_rect =
+      canvas_playback_rect - canvas_bitmap_rect.OffsetFromOrigin();
+  display_list_->Raster(canvas, callback, canvas_target_playback_rect,
+                        contents_scale);
 }
 
 skia::RefPtr<SkPicture> DisplayListRasterSource::GetFlattenedPicture() {
   TRACE_EVENT0("cc", "DisplayListRasterSource::GetFlattenedPicture");
 
   gfx::Rect display_list_rect(size_);
   SkPictureRecorder recorder;
   SkCanvas* canvas = recorder.beginRecording(display_list_rect.width(),
                                              display_list_rect.height());
   if (!display_list_rect.IsEmpty())
@@ skipping 94 matching lines @@
 }
 
 scoped_refptr<RasterSource> DisplayListRasterSource::CreateCloneWithoutLCDText()
     const {
   bool can_use_lcd_text = false;
   return scoped_refptr<RasterSource>(
       new DisplayListRasterSource(this, can_use_lcd_text));
 }
 
 }  // namespace cc