Compiler flags and macros added to shader debug report

The list of D3D compiler flags and macros used if
compilation of a shader succeeds is added to the
shader debug output.

BUG=angle:751

Change-Id: Ie84a586010787fe8d9c0dedfe9208f881058a588
Reviewed-on: https://chromium-review.googlesource.com/224970
Tested-by: Tibor Ouden, den <tibordenouden@gmail.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Remove build_angle.gyp.

This file is a duplicate of angle.gyp, and we can remove it now that
Chrome and Blink are finished with it.

BUG=angle:460

Change-Id: Ida68c8343921ebe9a37b5bcd982e114c91febc3d
Reviewed-on: https://chromium-review.googlesource.com/225053
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>