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Adds a .style.yapf file to //content/test/gpu and runs "git cl format"
on all the Python files in that directory.

Bug: 1076147
Change-Id: Idf5e8b40d4dacfbb42411cf1fdce5bb68bae471a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2171620
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763605}