cc: Cull DrawingDisplayItems outside of the raster playback rect

cc/playback/float_clip_display_item.cc

 // Copyright 2015 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/float_clip_display_item.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 FloatClipDisplayItem::FloatClipDisplayItem() {
 }
 
 FloatClipDisplayItem::~FloatClipDisplayItem() {
 }
 
 void FloatClipDisplayItem::SetNew(const gfx::RectF& clip_rect) {
   clip_rect_ = clip_rect;
 
   size_t memory_usage = sizeof(gfx::RectF);
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 1 /* op_count */,
                       memory_usage);
 }
 
 void FloatClipDisplayItem::Raster(SkCanvas* canvas,
+                                  const gfx::Rect& canvas_target_playback_rect,
                                   SkPicture::AbortCallback* callback) const {
   canvas->save();
   canvas->clipRect(gfx::RectFToSkRect(clip_rect_));
 }
 
 void FloatClipDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString(base::StringPrintf("FloatClipDisplayItem rect: [%s]",
                                          clip_rect_.ToString().c_str()));
 }
 
 EndFloatClipDisplayItem::EndFloatClipDisplayItem() {
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
                       0 /* memory_usage */);
 }
 
 EndFloatClipDisplayItem::~EndFloatClipDisplayItem() {
 }
 
-void EndFloatClipDisplayItem::Raster(SkCanvas* canvas,
-                                     SkPicture::AbortCallback* callback) const {
+void EndFloatClipDisplayItem::Raster(
+    SkCanvas* canvas,
+    const gfx::Rect& canvas_target_playback_rect,
+    SkPicture::AbortCallback* callback) const {
   canvas->restore();
 }
 
 void EndFloatClipDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString("EndFloatClipDisplayItem");
 }
 
 }  // namespace cc