Add varkha to OWNERS for ash/wm/dock

He is the primary author of all of this code.

BUG=none
TEST=none
R=oshima@chromium.org, varkha@chromium.org

Review URL: https://codereview.chromium.org/79703002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236352 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236352
Fix PDF browser tests on official waterfalls.

They were making asumptions about current working directory.

BUG=320093
R=jam@chromium.org

Review URL: https://codereview.chromium.org/67513007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236354 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236354