cc: Cull DrawingDisplayItems outside of the raster playback rect

cc/playback/filter_display_item.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/filter_display_item.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/output/render_surface_filters.h"
 #include "skia/ext/refptr.h"
@@ skipping 16 matching lines @@
   filters_ = filters;
   bounds_ = bounds;
 
   size_t memory_usage =
       sizeof(skia::RefPtr<SkImageFilter>) + sizeof(gfx::RectF);
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 1 /* op_count */,
                       memory_usage);
 }
 
 void FilterDisplayItem::Raster(SkCanvas* canvas,
+                               const gfx::Rect& canvas_target_playback_rect,
                                SkPicture::AbortCallback* callback) const {
   canvas->save();
   canvas->translate(bounds_.x(), bounds_.y());
 
   skia::RefPtr<SkImageFilter> image_filter =
       RenderSurfaceFilters::BuildImageFilter(
           filters_, gfx::SizeF(bounds_.width(), bounds_.height()));
   SkRect boundaries;
   image_filter->computeFastBounds(
       SkRect::MakeWH(bounds_.width(), bounds_.height()), &boundaries);
@@ skipping 14 matching lines @@
 
 EndFilterDisplayItem::EndFilterDisplayItem() {
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
                       0 /* memory_usage */);
 }
 
 EndFilterDisplayItem::~EndFilterDisplayItem() {
 }
 
 void EndFilterDisplayItem::Raster(SkCanvas* canvas,
+                                  const gfx::Rect& canvas_target_playback_rect,
                                   SkPicture::AbortCallback* callback) const {
   canvas->restore();
   canvas->restore();
 }
 
 void EndFilterDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString("EndFilterDisplayItem");
 }
 
 }  // namespace cc