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Also adds a complemetary DEPS file, in a subset of the gclient DEPS format, that specifies what files are needed for telemetry.

third_party/davclient is required to make interfacing with a WebDAV server simpler.

BUG=162301
NOTRY=True

Review URL: https://chromiumcodereview.appspot.com/11741030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176078 0039d316-1c4b-4281-b951-d872f2087c98