Continue threading context through unit tests.

- views_unittest now passes with the assert that checks that we have context.
- ash_unittest...is making progress towards that and this patch is already big.

BUG=161882

Review URL: https://codereview.chromium.org/11795004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175389 0039d316-1c4b-4281-b951-d872f2087c98
23 files changed