- added most part of inspector tests that depends only on JavaScript domains.

BUG=chromium:635948
R=dgozman@chromium.org,alph@chromium.org

Committed: https://crrev.com/9ddbdab195923fc87fae3587ae06c5c1c5ca6d79
Review-Url: https://codereview.chromium.org/2369753004
Cr-Original-Commit-Position: refs/heads/master@{#39897}
Cr-Commit-Position: refs/heads/master@{#39931}