Further plumb visual rect into cc:DisplayItemList.

ui/compositor/paint_cache.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 "ui/compositor/paint_cache.h"
 
 #include "cc/playback/display_item_list.h"
 #include "ui/compositor/paint_context.h"
 
 namespace ui {
 
 PaintCache::PaintCache() : has_cache_(false) {
 }
 
 PaintCache::~PaintCache() {
 }
 
 bool PaintCache::UseCache(const PaintContext& context) {
   if (!has_cache_)
     return false;
   DCHECK(context.list_);
-  auto* item = context.list_->CreateAndAppendItem<cc::DrawingDisplayItem>();
+  auto* item =
+      context.list_->CreateAndAppendItem<cc::DrawingDisplayItem>(visual_rect_);
   display_item_.CloneTo(item);
   return true;
 }
 
-void PaintCache::SetCache(const cc::DrawingDisplayItem* item) {
+void PaintCache::SetCache(const gfx::Rect& visual_rect,
+                          const cc::DrawingDisplayItem* item) {
+  visual_rect_ = visual_rect;
   item->CloneTo(&display_item_);
   has_cache_ = true;
 }
 
 }  // namespace ui