This is a reland of 3f286cd1
Original change's description:
> Clean up the TType class.
>
> Move more methods into the cpp file, and rename member variables to
> start with the "m" prefix.
>
> Also move most of the TPublicType methods into the cpp.
>
> Bug: angleproject:1432
> Change-Id: Ib11a3c8c6ace654fd52077a317814665f81a7261
> Reviewed-on: https://chromium-review.googlesource.com/776276
> Reviewed-by: Kai Ninomiya <kainino@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Bug: angleproject:1432
Bug: chromium:786603
Change-Id: I7f91557d9f9065f4aa90130ce30dc27e9f796065
Reviewed-on: https://chromium-review.googlesource.com/777715
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>