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ShellTestBaseAura augments extensions::ExtensionsTest and also sets up
the Aura environment. app_shell_unittests test classes can derive from
ShellTestBaseAura to get this set-up for free, instead of deriving from
either ExtensionsTest (which doesn't create a
ShellExtensionsBrowserClient) or AuraTestBase (which sets up its own
Screen and RootWindow).

In particular, deriving ShellDesktopControllerAuraTest from AuraTestBase
doesn't make sense because the ShellDesktopControllerAura creates
its own screen and RootWindow.

This also provides ShellTestHelperAura, which can be used as a class
member to get shell environment set-up without deriving a test from
ExtensionsTest.

Change-Id: I4565c985c77444ebc7325fd7d5295d028f85f774
Reviewed-on: https://chromium-review.googlesource.com/591641
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491934}