Add support for android in gpu test expections parser

So the parser can know 'Android' platform. Also the failed case
'GPUTestExpectationsParserTest.WebGLTestExpectationsValidation'
is passed.

BUG=118542
TEST=content_unittests


Review URL: https://chromiumcodereview.appspot.com/10833003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148719 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed