Add builders for tracing event's structural arguments

cc/quads/shared_quad_state.h

Index: cc/quads/shared_quad_state.h
diff --git a/cc/quads/shared_quad_state.h b/cc/quads/shared_quad_state.h
index 30a1e25b3d33ff7367f4ecf6e23b98daad8d31f5..dde87a8511e7ca813a746c1d6326249308d79d44 100644
--- a/cc/quads/shared_quad_state.h
+++ b/cc/quads/shared_quad_state.h
@@ -12,6 +12,9 @@
 #include "ui/gfx/transform.h"
 
 namespace base {
+namespace debug {
+class TracedValue;
+}
 class Value;
 }
 
@@ -37,7 +40,7 @@ class CC_EXPORT SharedQuadState {
               float opacity,
               SkXfermode::Mode blend_mode,
               int sorting_context_id);
-  scoped_ptr<base::Value> AsValue() const;
+  void AsValueInto(base::debug::TracedValue* dict) const;
 
   // Transforms from quad's original content space to its target content space.
   gfx::Transform content_to_target_transform;