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Several changes to the bindings [1] landed while the change that added the
mock writer was in review [2].  The mock writer wasn't rerun right before it
landed, so its output is out-of-sync with the bindings metadata.

Rerun the generator to fix things up. This is a prerequisite for a change
I want to make to the generator.

1: https://chromium-review.googlesource.com/c/chromium/src/+/766687,
   https://chromium-review.googlesource.com/c/chromium/src/+/779087
2: https://chromium-review.googlesource.com/c/chromium/src/+/772810

Bug: 761432,550065
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;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
Change-Id: I1ad3658c8f92bdd587d1659bb21d58ac71a549f6
Reviewed-on: https://chromium-review.googlesource.com/953382Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541576}