GitLab

Add support enabling zip/unzip in the integration test base class. Any
derived class can request support in test by overriding method:

  GetNeedsZipSupport()

The default implementation returns false. Add ZipCase derived from the
TestCase class, and an overriden method, in the FileManagerBrowserTest
class. Future TODO: write test to exercise zip/unzip support.

Bug: 864256,865197,836412
Change-Id: I3dc5b17023506ef3a2fa57611fff16ee68ead43e
Reviewed-on: https://chromium-review.googlesource.com/1149438Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577814}