Add builders for tracing event's structural arguments

cc/output/filter_operation.h

Index: cc/output/filter_operation.h
diff --git a/cc/output/filter_operation.h b/cc/output/filter_operation.h
index cfaf529044388b89638db47226f67510fb409e15..fc14cb1017ade130fe2cfa6c1bf7e70a4b92e825 100644
--- a/cc/output/filter_operation.h
+++ b/cc/output/filter_operation.h
@@ -16,6 +16,9 @@
 #include "ui/gfx/geometry/point.h"
 
 namespace base {
+namespace debug {
+class TracedValue;
+}
 class Value;
 }
 
@@ -220,7 +223,7 @@ class CC_EXPORT FilterOperation {
                                const FilterOperation* to,
                                double progress);
 
-  scoped_ptr<base::Value> AsValue() const;
+  void AsValueInto(base::debug::TracedValue* value) const;
 
  private:
   FilterOperation(FilterType type, float amount);