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Before 0.5, render strings looked like this:

    Gallium 0.4 on llvmpipe (LLVM 4.0, 256 bits)

now they look like this:

    llvmpipe (LLVM 5.0, 256 bits)

Change the regex accordingly to avoid accidentally not matching
the llvmpipe renderer string.

Bug: 854437
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I14a7a7631880b2dcfcd3af5eeb6c01d5be32edb6
Reviewed-on: https://chromium-review.googlesource.com/1108216
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569747}