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Create a SetCapabilities in FakeDriveService and call it from
file_manager_browsertest_base.cc, which sets the capabilities for entries added
in browser tests.

This patch unlocks support for capabilities in browser tests.

Bug: 719959
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I39be97972f9aaf013849d1150a2a25a7e88bc62d
Reviewed-on: https://chromium-review.googlesource.com/1081772
Commit-Queue: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566319}