Move gpu jason file data generation to build time.

BUG=691703
TEST=chrome
R=piman@chromium.org
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

Review-Url: https://codereview.chromium.org/2812003006
Cr-Commit-Position: refs/heads/master@{#464235}
10 files changed