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Mock and test classes are moved into separate files and renamed appropriately.
The new files are moved into a separate source set that will later be used by
other tests.  Use of the SetImplementation call is revised; the 'deprecated'
version that doesn't take ownership is considered to be legitimate and renamed.
Additional test and mock classes that model environment of the Wayland buffer
manager are introduced.

Bug: 926155
Change-Id: Ia1056a3d1051b12fdc49fd3a11c5fdeb7a558dbd
Reviewed-on: https://chromium-review.googlesource.com/c/1443115Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#627044}