HTML Ruby tag is not exposed on Windows

According to latest editor's draft http://rawgit.com/w3c/html-api-map/master/index.html
html ruby tag should be exposed as below:

MSAA+UIA Role:ROLE_SYSTEM_TEXT
MSAA+IA2 Role:IA2_ROLE_TEXT_FRAME

AX: ?

BUG=426893

Review URL: https://codereview.chromium.org/700293004

Cr-Commit-Position: refs/heads/master@{#303494}
10 files changed