Don't access DisplayItemClient::VisualRect() for cached display items.

third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.cpp b/third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.cpp
index 1f78695231ce57869287f269829cf8bd1e1ddf51..34a7547a278738643a32e87de37f4914ae9c42b7 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItemList.cpp
@@ -14,28 +14,6 @@
 
 namespace blink {
 
-DisplayItem& DisplayItemList::AppendByMoving(DisplayItem& item) {
-#ifndef NDEBUG
-  String original_debug_string = item.AsDebugString();
-#endif
-  DCHECK(item.HasValidClient());
-  DisplayItem& result =
-      ContiguousContainer::AppendByMoving(item, item.DerivedSize());
-  // ContiguousContainer::appendByMoving() calls an in-place constructor
-  // on item which replaces it with a tombstone/"dead display item" that
-  // can be safely destructed but should never be used.
-  DCHECK(!item.HasValidClient());
-#ifndef NDEBUG
-  // Save original debug string in the old item to help debugging.
-  item.SetClientDebugString(original_debug_string);
-#endif
-  return result;
-}
-
-void DisplayItemList::AppendVisualRect(const IntRect& visual_rect) {
-  visual_rects_.push_back(visual_rect);
-}
-
 DisplayItemList::Range<DisplayItemList::iterator>
 DisplayItemList::ItemsInPaintChunk(const PaintChunk& paint_chunk) {
   return Range<iterator>(begin() + paint_chunk.begin_index,
@@ -99,14 +77,9 @@ std::unique_ptr<JSONArray> DisplayItemList::SubsequenceAsJSON(
       }
 #endif
     }
-    if (HasVisualRect(i)) {
-      IntRect local_visual_rect = VisualRect(i);
-      json->SetString(
-          "visualRect",
-          String::Format("[%d,%d %dx%d]", local_visual_rect.X(),
-                         local_visual_rect.Y(), local_visual_rect.Width(),
-                         local_visual_rect.Height()));
-    }
+
+    json->SetString("visualRect", display_item.VisualRect().ToString());
+
     json_array->PushObject(std::move(json));
   }
   return json_array;