Implemented renderer tests helpers.

Change-Id: I38e1e14457f706566797fa89eff18641e1fd7105
Reviewed-on: https://chromium-review.googlesource.com/1145593
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Peter Kvitek <kvitekp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576979}
3 files changed