Use EXT_robustness where available on GLES2 platforms to detect and respond to resets of the graphics card.

BUG=138162
TEST=ran https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/conformance-suites/1.0.1/extra/slow-shader-example.html on Windows with ANGLE and verified that new code path was taken


Review URL: https://chromiumcodereview.appspot.com/10822029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148721 0039d316-1c4b-4281-b951-d872f2087c98
16 files changed