Constify SkPicture in DrawingDisplayItem (cc side)

cc/blink/web_display_item_list_impl.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/blink/web_display_item_list_impl.h"
 
 #include <vector>
 
 #include "cc/blink/web_blend_mode.h"
 #include "cc/resources/clip_display_item.h"
@@ skipping 15 matching lines @@
 
 WebDisplayItemListImpl::WebDisplayItemListImpl()
     : display_item_list_(cc::DisplayItemList::Create()) {
 }
 
 scoped_refptr<cc::DisplayItemList> WebDisplayItemListImpl::ToDisplayItemList() {
   return display_item_list_;
 }
 
 void WebDisplayItemListImpl::appendDrawingItem(
+    const SkPicture* picture,
+    const blink::WebFloatPoint& location) {
+  display_item_list_->AppendItem(
+      cc::DrawingDisplayItem::Create(skia::SharePtr(picture)));
+}
+
+void WebDisplayItemListImpl::appendDrawingItem(
     SkPicture* picture,
     const blink::WebFloatPoint& location) {
   display_item_list_->AppendItem(
-      cc::DrawingDisplayItem::Create(skia::SharePtr(picture), location));
+      cc::DrawingDisplayItem::Create(skia::SharePtr(picture)));
 }
 
 void WebDisplayItemListImpl::appendClipItem(
     const blink::WebRect& clip_rect,
     const blink::WebVector<SkRRect>& rounded_clip_rects) {
   std::vector<SkRRect> rounded_rects;
   for (size_t i = 0; i < rounded_clip_rects.size(); ++i) {
     rounded_rects.push_back(rounded_clip_rects[i]);
   }
   display_item_list_->AppendItem(
@@ skipping 53 matching lines @@
 }
 
 void WebDisplayItemListImpl::appendEndFilterItem() {
   display_item_list_->AppendItem(cc::EndFilterDisplayItem::Create());
 }
 
 WebDisplayItemListImpl::~WebDisplayItemListImpl() {
 }
 
 }  // namespace cc_blink