Trace picture piles on layers

cc/base/math_util.cc

Index: cc/base/math_util.cc
diff --git a/cc/base/math_util.cc b/cc/base/math_util.cc
index 7873d931913b4ce0835f6e5a44cd50813b4c55b4..4123cf82934cc93c8fc79dd2f183e04dc5ea5fa3 100644
--- a/cc/base/math_util.cc
+++ b/cc/base/math_util.cc
@@ -526,6 +526,15 @@ scoped_ptr<base::Value> MathUtil::AsValue(gfx::Size s) {
   return res.PassAs<base::Value>();
 }
 
+scoped_ptr<base::Value> MathUtil::AsValue(gfx::Rect r) {
+  scoped_ptr<base::ListValue> res(new base::ListValue());
+  res->AppendInteger(r.x());
+  res->AppendInteger(r.y());
+  res->AppendInteger(r.width());
+  res->AppendInteger(r.height());
+  return res.PassAs<base::Value>();
+}
+
 scoped_ptr<base::Value> MathUtil::AsValue(gfx::PointF pt) {
   scoped_ptr<base::ListValue> res(new base::ListValue());
   res->AppendDouble(pt.x());