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Also other minor improvements in sync scripts.

In BUILD.public, include all files under resources as data dependencies for DM. Omit newly failing DM tests and add newly passing DM tests.

Adds the OpenClipart "license" to LICENSE per comment in google3 CL 100158380.

Corresponding google3 CL is 105602927.

BUG=skia:

Review URL: https://codereview.chromium.org/1406283002