This patch refactors ProgramD3D by storing all shader information
into ShaderMap to simplify the code structure.

This patch also fixes a bug on getting the number of maximum uniform
blocks.

BUG=angleproject:2169

Change-Id: I5b9fbfd70a18f8731ce19efed0df88037d495389
Reviewed-on: https://chromium-review.googlesource.com/1024749
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>