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There are a couple of issues addressed here:
. kFocusable_InitProperty was not wired up correctly.
. Ash created top-levels were not picking up the value set by clients

To fix these I'm adding kCanFocus. ws2 sets this from calls by clients to
WindowTree::SetCanFocus(). Ash uses this property as well if the client
supplies kFocusable_InitProperty. I think kFocusable_InitProperty should
go away. That'll be easier once we get rid of --mash.

I'm also forking the TopLevelWindowFactory tests. I moved the existing
ones into TopLevelWindowFactoryMash (these only run with --mash). I also
made the tests work in classic mode with ws2. I added a new file for this
that is built in ash_unittests.

BUG=842301
TEST=covered by tests

Change-Id: I016ed612e7ab1d7bc1cdc4840c3aa9271078ab9e
Reviewed-on: https://chromium-review.googlesource.com/1086151
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564646}