Add builders for tracing event's structural arguments

cc/base/region.cc

 // Copyright (c) 2012 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/base/region.h"
+#include "base/debug/trace_event_argument.h"
 #include "base/values.h"
 
 namespace cc {
 
 Region::Region() {
 }
 
 Region::Region(const Region& region)
     : skregion_(region.skregion_) {
 }
@@ skipping 97 matching lines @@
   for (Iterator it(*this); it.has_rect(); it.next()) {
     gfx::Rect rect(it.rect());
     result->AppendInteger(rect.x());
     result->AppendInteger(rect.y());
     result->AppendInteger(rect.width());
     result->AppendInteger(rect.height());
   }
   return result.PassAs<base::Value>();
 }
 
+void Region::AsValueInto(base::debug::TracedValue* result) const {
+  for (Iterator it(*this); it.has_rect(); it.next()) {
+    gfx::Rect rect(it.rect());
+    result->AppendInteger(rect.x());
+    result->AppendInteger(rect.y());
+    result->AppendInteger(rect.width());
+    result->AppendInteger(rect.height());
+  }
+}
+
 Region::Iterator::Iterator() {
 }
 
 Region::Iterator::Iterator(const Region& region)
     : it_(region.skregion_) {
 }
 
 Region::Iterator::~Iterator() {
 }
 
 }  // namespace cc