Update from https://crrev.com/314320

cc/resources/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/resources/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(const gfx::Transform& transform)
     : transform_(transform) {
 }
 
 TransformDisplayItem::~TransformDisplayItem() {
 }
@@ skipping 10 matching lines @@
 }
 
 int TransformDisplayItem::ApproximateOpCount() const {
   return 1;
 }
 
 size_t TransformDisplayItem::PictureMemoryUsage() const {
   return sizeof(gfx::Transform);
 }
 
+void TransformDisplayItem::AsValueInto(base::debug::TracedValue* array) const {
+  array->AppendString(base::StringPrintf("TransformDisplayItem transform: [%s]",
+                                         transform_.ToString().c_str()));
+}
+
 EndTransformDisplayItem::EndTransformDisplayItem() {
 }
 
 EndTransformDisplayItem::~EndTransformDisplayItem() {
 }
 
 void EndTransformDisplayItem::Raster(SkCanvas* canvas,
                                      SkDrawPictureCallback* callback) const {
   canvas->restore();
 }
 
 bool EndTransformDisplayItem::IsSuitableForGpuRasterization() const {
   return true;
 }
 
 int EndTransformDisplayItem::ApproximateOpCount() const {
   return 0;
 }
 
 size_t EndTransformDisplayItem::PictureMemoryUsage() const {
   return 0;
 }
 
+void EndTransformDisplayItem::AsValueInto(
+    base::debug::TracedValue* array) const {
+  array->AppendString("EndTransformDisplayItem");
+}
+
 }  // namespace cc