cc: Cull DrawingDisplayItems outside of the raster playback rect

cc/playback/transform_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/transform_display_item.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 
 namespace cc {
 
 TransformDisplayItem::TransformDisplayItem()
     : transform_(gfx::Transform::kSkipInitialization) {
 }
 
 TransformDisplayItem::~TransformDisplayItem() {
 }
 
 void TransformDisplayItem::SetNew(const gfx::Transform& transform) {
   transform_ = transform;
 
   size_t memory_usage = sizeof(gfx::Transform);
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 1 /* op_count */,
                       memory_usage);
 }
 
 void TransformDisplayItem::Raster(SkCanvas* canvas,
+                                  const gfx::Rect& canvas_target_playback_rect,
                                   SkPicture::AbortCallback* callback) const {
   canvas->save();
   if (!transform_.IsIdentity())
     canvas->concat(transform_.matrix());
 }
 
 void TransformDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString(base::StringPrintf("TransformDisplayItem transform: [%s]",
                                          transform_.ToString().c_str()));
 }
 
 EndTransformDisplayItem::EndTransformDisplayItem() {
   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
                       0 /* memory_usage */);
 }
 
 EndTransformDisplayItem::~EndTransformDisplayItem() {
 }
 
-void EndTransformDisplayItem::Raster(SkCanvas* canvas,
-                                     SkPicture::AbortCallback* callback) const {
+void EndTransformDisplayItem::Raster(
+    SkCanvas* canvas,
+    const gfx::Rect& canvas_target_playback_rect,
+    SkPicture::AbortCallback* callback) const {
   canvas->restore();
 }
 
 void EndTransformDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString("EndTransformDisplayItem");
 }
 
 }  // namespace cc