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This adds a unit test that the V2 renderer sandbox profile cannot write
to the homedir.

Bug: 902597
Change-Id: I6b8c850bdafcb377070e22ed2a1459bcd631b69c
Reviewed-on: https://chromium-review.googlesource.com/c/1321862Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606956}