Working around the aspectJ implementation.

Instead of fully implementing the aspectJ, here we just parse the Box at the
constructor.
The code originially use aspects to implement the parse on demand for various
member functions. However, we can actually just parse in the constructor since
trimming need to parse most of the boxes anyway.

bug:7093055

Change-Id: If53fa9a413d561be80dbd6c4c37b0a14a9cec610