The Android WebView code includes several manually-maintained .mk files
that are included by the Android build system. These contain some fairly
long lines as they need to refer to deep pathnames, which means the CQ
cannot be used as it always triggers a presubmit warning.

Allow .mk files to have 200 columns per line instead, which should be
enough for the long paths that are used. Add a test case for this.

BUG=


Review URL: https://chromiumcodereview.appspot.com/12252067

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@182733 0039d316-1c4b-4281-b951-d872f2087c98