Create unit tests for RenderTextPainter::textPaintingStyle.

There's some non-trivial logic here about resolving colors that
benefits from some simple unit tests.

Review URL: https://codereview.chromium.org/614623002

git-svn-id: svn://svn.chromium.org/blink/trunk@182840 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r182812

http://src.chromium.org/viewvc/blink?view=revision&revision=182812

BUG=403211
TBR=dominik.rottsches@intel.com

Review URL: https://codereview.chromium.org/613693002

git-svn-id: svn://svn.chromium.org/blink/trunk@182841 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: make revealers and renderers Promise-based

R=apavlov@chromium.org, vsevik@chromium.org

Review URL: https://codereview.chromium.org/610213002

git-svn-id: svn://svn.chromium.org/blink/trunk@182842 bbb929c8-8fbe-4397-9dbb-9b2b20218538