Add Drive API parser for About/Apps json

BUG=chromium:127728
TEST=unit_test --gtest_filter="DriveApiParser.*"

Review URL: https://chromiumcodereview.appspot.com/10810070

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148692 0039d316-1c4b-4281-b951-d872f2087c98