cc: Cull DrawingDisplayItems outside of the raster playback rect

cc/playback/clip_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/clip_display_item.h"
 
 #include <string>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 15 matching lines @@
 
   size_t memory_usage = sizeof(gfx::Rect);
   for (size_t i = 0; i < rounded_clip_rects_.size(); ++i) {
     memory_usage += sizeof(rounded_clip_rects_[i]);
   }
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 1 /* op_count */,
                       memory_usage);
 }
 
 void ClipDisplayItem::Raster(SkCanvas* canvas,
+                             const gfx::Rect& canvas_target_playback_rect,
                              SkPicture::AbortCallback* callback) const {
   canvas->save();
   canvas->clipRect(SkRect::MakeXYWH(clip_rect_.x(), clip_rect_.y(),
                                     clip_rect_.width(), clip_rect_.height()));
   for (size_t i = 0; i < rounded_clip_rects_.size(); ++i) {
     if (rounded_clip_rects_[i].isRect()) {
       canvas->clipRect(rounded_clip_rects_[i].rect());
     } else {
       bool antialiased = true;
       canvas->clipRRect(rounded_clip_rects_[i], SkRegion::kIntersect_Op,
@@ skipping 30 matching lines @@
 
 EndClipDisplayItem::EndClipDisplayItem() {
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
                       0 /* memory_usage */);
 }
 
 EndClipDisplayItem::~EndClipDisplayItem() {
 }
 
 void EndClipDisplayItem::Raster(SkCanvas* canvas,
+                                const gfx::Rect& canvas_target_playback_rect,
                                 SkPicture::AbortCallback* callback) const {
   canvas->restore();
 }
 
 void EndClipDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString("EndClipDisplayItem");
 }
 
 }  // namespace cc