Added ability to specify disabled extensions in the GPU Workarounds.
This CL adds the ability to specify a "disabled_extensions" field in
the GPU Workarounds JSON file. Currently this is only an aesthetic
change and just makes it show up as a table next to "GL_EXTENSIONS"
when you go to "chrome://gpu". Eventually we should make this field
automatically filter out extensions from GL_EXTENSIONS.
Currently I have only added extensions for a couple for testing. I
will create another CL after this which adds disabled extensions to
all the other workarounds which attempt to disable extensions.
R=zmo@chromium.org
BUG=482067
Review URL: https://codereview.chromium.org/
1110203003
Cr-Commit-Position: refs/heads/master@{#328012}