Format generated gpu files using clang-format.

Just reformatting, no code change.

BUG=349140
TEST=tree
R=bajones@chromium.org, dmichael@chromium.org
TBR=piman@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/181903006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254891 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254891