GitLab

Currently there is only AppListServiceInteractiveTest which is excessive
for tests that do not need to be interactive. It also leaves gaps in the
testing of the AppListServiceImpl, since it only uses the parent,
AppListService interface.

This CL adds scaffolding for better app list test coverage, leading up
to better testing for Chrome's AppListViewDelegate, which is currently
hard to get at in a test.

The test is a non-interactive version of showing the app list, which
verifies expectations about the actual Profile* that is missing from
current tests (e.g. TestingAppListServiceImpl has it mocked out to
return NULL, since unit_tests don't have a ProfileManager).

BUG=169114

Review URL: https://codereview.chromium.org/552153002

Cr-Commit-Position: refs/heads/master@{#294138}