gpu driver bug list: correctly backlist partial swap on Mesa

This entry previously used "gl_vendor": "Mesa" when the GL_VENDOR string
is "Intel Open Source Technology Center". Try to match "Mesa" in the
GL_RENDERER string instead.

BUG=339493
BUG=628168
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2156993004
Cr-Commit-Position: refs/heads/master@{#406194}
1 file changed