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For WebGL conformance test, we can specify some conditions to limit the
test environment that one test case may fail. But these conditions don't
include graphics driver information. By this patch, the WebGL test
framework can generate driver tags based on the vendor and version of
the graphics driver of current system for the expectations file. The
format of driver tag is as below:
crbug.com/123 [ linux mesa_lt_18.0.5 ] abc.html [ Failure ]

When adding or removing driver tags in the expectatioins file, it's also
necessary to modify the list of available driver tags in the header of
webgl_conformance_integration_test.py.

Bug: 957515
Change-Id: I29835cae0b042cd86eb4fa438f60803e371d8d1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1647464
Commit-Queue: Lin Sun <lin.sun@intel.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672596}