Update from https://crrev.com/314320

cc/resources/clip_path_display_item.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 "cc/resources/clip_path_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 {
 
 ClipPathDisplayItem::ClipPathDisplayItem(const SkPath& clip_path,
                                          SkRegion::Op clip_op,
                                          bool antialias)
     : clip_path_(clip_path), clip_op_(clip_op), antialias_(antialias) {
 }
 
@@ skipping 12 matching lines @@
 
 int ClipPathDisplayItem::ApproximateOpCount() const {
   return 1;
 }
 
 size_t ClipPathDisplayItem::PictureMemoryUsage() const {
   size_t total_size = sizeof(SkPath) + sizeof(SkRegion::Op) + sizeof(bool);
   return total_size;
 }
 
+void ClipPathDisplayItem::AsValueInto(base::debug::TracedValue* array) const {
+  array->AppendString(base::StringPrintf("ClipPathDisplayItem length: %d",
+                                         clip_path_.countPoints()));
+}
+
 EndClipPathDisplayItem::EndClipPathDisplayItem() {
 }
 
 EndClipPathDisplayItem::~EndClipPathDisplayItem() {
 }
 
 void EndClipPathDisplayItem::Raster(SkCanvas* canvas,
                                     SkDrawPictureCallback* callback) const {
   canvas->restore();
 }
 
 bool EndClipPathDisplayItem::IsSuitableForGpuRasterization() const {
   return true;
 }
 
 int EndClipPathDisplayItem::ApproximateOpCount() const {
   return 0;
 }
 
 size_t EndClipPathDisplayItem::PictureMemoryUsage() const {
   return 0;
 }
 
+void EndClipPathDisplayItem::AsValueInto(
+    base::debug::TracedValue* array) const {
+  array->AppendString("EndClipPathDisplayItem");
+}
+
 }  // namespace cc