Update from https://crrev.com/314320

cc/resources/clip_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/clip_display_item.h"
 
+#include <string>
+
+#include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event_argument.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 ClipDisplayItem::ClipDisplayItem(gfx::Rect clip_rect,
                                  const std::vector<SkRRect>& rounded_clip_rects)
     : clip_rect_(clip_rect), rounded_clip_rects_(rounded_clip_rects) {
 }
 
 ClipDisplayItem::~ClipDisplayItem() {
 }
@@ skipping 23 matching lines @@
 }
 
 size_t ClipDisplayItem::PictureMemoryUsage() const {
   size_t total_size = sizeof(gfx::Rect);
   for (size_t i = 0; i < rounded_clip_rects_.size(); ++i) {
     total_size += sizeof(rounded_clip_rects_[i]);
   }
   return total_size;
 }
 
+void ClipDisplayItem::AsValueInto(base::debug::TracedValue* array) const {
+  std::string value = base::StringPrintf("ClipDisplayItem rect: [%s]",
+                                         clip_rect_.ToString().c_str());
+  for (const SkRRect& rounded_rect : rounded_clip_rects_) {
+    base::StringAppendF(
+        &value, " rounded_rect: [rect: [%s]",
+        gfx::SkRectToRectF(rounded_rect.rect()).ToString().c_str());
+    base::StringAppendF(&value, " radii: [");
+    SkVector upper_left_radius = rounded_rect.radii(SkRRect::kUpperLeft_Corner);
+    base::StringAppendF(&value, "[%f,%f],", upper_left_radius.x(),
+                        upper_left_radius.y());
+    SkVector upper_right_radius =
+        rounded_rect.radii(SkRRect::kUpperRight_Corner);
+    base::StringAppendF(&value, " [%f,%f],", upper_right_radius.x(),
+                        upper_right_radius.y());
+    SkVector lower_right_radius =
+        rounded_rect.radii(SkRRect::kLowerRight_Corner);
+    base::StringAppendF(&value, " [%f,%f],", lower_right_radius.x(),
+                        lower_right_radius.y());
+    SkVector lower_left_radius = rounded_rect.radii(SkRRect::kLowerLeft_Corner);
+    base::StringAppendF(&value, " [%f,%f]]", lower_left_radius.x(),
+                        lower_left_radius.y());
+  }
+  array->AppendString(value);
+}
+
 EndClipDisplayItem::EndClipDisplayItem() {
 }
 
 EndClipDisplayItem::~EndClipDisplayItem() {
 }
 
 void EndClipDisplayItem::Raster(SkCanvas* canvas,
                                 SkDrawPictureCallback* callback) const {
   canvas->restore();
 }
 
 bool EndClipDisplayItem::IsSuitableForGpuRasterization() const {
   return true;
 }
 
 int EndClipDisplayItem::ApproximateOpCount() const {
   return 0;
 }
 
 size_t EndClipDisplayItem::PictureMemoryUsage() const {
   return 0;
 }
 
+void EndClipDisplayItem::AsValueInto(base::debug::TracedValue* array) const {
+  array->AppendString("EndClipDisplayItem");
+}
+
 }  // namespace cc