Add builders for tracing event's structural arguments

cc/quads/render_pass.h

Index: cc/quads/render_pass.h
diff --git a/cc/quads/render_pass.h b/cc/quads/render_pass.h
index 3032f050d4c2396e3898e48f3fcae410e217c36e..8d4114206351f01d6933e4e35650f93334c16d97 100644
--- a/cc/quads/render_pass.h
+++ b/cc/quads/render_pass.h
@@ -18,6 +18,9 @@
 #include "ui/gfx/transform.h"
 
 namespace base {
+namespace debug {
+class TracedValue;
+}
 class Value;
 };
 
@@ -87,7 +90,7 @@ class CC_EXPORT RenderPass {
               const gfx::Transform& transform_to_root_target,
               bool has_transparent_background);
 
-  scoped_ptr<base::Value> AsValue() const;
+  void AsValueInto(base::debug::TracedValue* dict) const;
 
   SharedQuadState* CreateAndAppendSharedQuadState();
   template <typename DrawQuadType>