Apply SVG paint-order to text-decorations

BUG=360571

Review URL: https://codereview.chromium.org/225023029

git-svn-id: svn://svn.chromium.org/blink/trunk@171070 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Blink-side: Prepare for using Mojo to implement HTML MessagePort

With Mojo, a MessagePipe is created as a pair of handles. Each of these handles will correspond to a MessagePort.

Chromium-side:
https://codereview.chromium.org/225023035

BUG=361001

Review URL: https://codereview.chromium.org/227613010

git-svn-id: svn://svn.chromium.org/blink/trunk@171071 bbb929c8-8fbe-4397-9dbb-9b2b20218538