In build/gyp_chromium, if CHROMIUM_GYP_SYNTAX_CHECK is set to 1, run gyp with --check.
In build/gyp_chromium, if CHROMIUM_GYP_SYNTAX_CHECK is set to 1, run gyp with --check.

This is to eventually run gyp with syntax checking enabled on the buildbots.
Enabling that will come in a later CL after all gyp errors are fixed.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1435001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@42788 0039d316-1c4b-4281-b951-d872f2087c98

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