Update from https://crrev.com/314320

cc/resources/clip_path_display_item.cc

Index: cc/resources/clip_path_display_item.cc
diff --git a/cc/resources/clip_path_display_item.cc b/cc/resources/clip_path_display_item.cc
index 4012124cd0efdf3533baba5d5380958d267ebe1f..1600e5511048b0790964763575dd6fc4e1ac0552 100644
--- a/cc/resources/clip_path_display_item.cc
+++ b/cc/resources/clip_path_display_item.cc
@@ -4,6 +4,8 @@
 
 #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 {
@@ -36,6 +38,11 @@ size_t ClipPathDisplayItem::PictureMemoryUsage() const {
   return total_size;
 }
 
+void ClipPathDisplayItem::AsValueInto(base::debug::TracedValue* array) const {
+  array->AppendString(base::StringPrintf("ClipPathDisplayItem length: %d",
+                                         clip_path_.countPoints()));
+}
+
 EndClipPathDisplayItem::EndClipPathDisplayItem() {
 }
 
@@ -59,4 +66,9 @@ size_t EndClipPathDisplayItem::PictureMemoryUsage() const {
   return 0;
 }
 
+void EndClipPathDisplayItem::AsValueInto(
+    base::debug::TracedValue* array) const {
+  array->AppendString("EndClipPathDisplayItem");
+}
+
 }  // namespace cc