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This CL adds a few things:
- autogenerated unittests
- associated mocks
- associated test drivers
- enough implementation in raster_decoder.cc to make the tests pass

No changes to GLES2 autogen.

Bug: 789238
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: Iac2ee4922a21f3bd11ff58693e2e5fb1fe26bd45
Reviewed-on: https://chromium-review.googlesource.com/891988
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: Victor Miura <vmiura@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533291}