Add GL_CHROMIUM_map_sub functions to GrGLInterface and bit to GrGLCaps.

BUG=skia:2402
R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/231773003

git-svn-id: http://skia.googlecode.com/svn/trunk@14199 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed