Use sk_sp-based picture recording APIs

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 446 matching lines @@
 
 void LayerImpl::set_user_scrollable_vertical(bool scrollable) {
   user_scrollable_vertical_ = scrollable;
 }
 
 bool LayerImpl::user_scrollable(ScrollbarOrientation orientation) const {
   return (orientation == HORIZONTAL) ? user_scrollable_horizontal_
                                      : user_scrollable_vertical_;
 }
 
-skia::RefPtr<SkPicture> LayerImpl::GetPicture() {
-  return skia::RefPtr<SkPicture>();
+sk_sp<SkPicture> LayerImpl::GetPicture() {
+  return nullptr;
 }
 
 scoped_ptr<LayerImpl> LayerImpl::CreateLayerImpl(LayerTreeImpl* tree_impl) {
   return LayerImpl::Create(tree_impl, layer_id_);
 }
 
 void LayerImpl::set_main_thread_scrolling_reasons(
     uint32_t main_thread_scrolling_reasons) {
   if (main_thread_scrolling_reasons_ == main_thread_scrolling_reasons)
     return;
@@ skipping 1101 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc