Reland r165040 "Make ancestors of modal <dialog> inert"

Original code review: https://codereview.chromium.org/133393002/
r165040 was reverted due to failing a11y tests in
content_browsertests; they have been disabled and will be rebaselined
after this change is rolled in.

BUG=329407
TBR=esprehn

Review URL: https://codereview.chromium.org/139183002

git-svn-id: svn://svn.chromium.org/blink/trunk@165211 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Updating TestExpectations

TBR=dstockwell
BUG=

Review URL: https://codereview.chromium.org/140783002

git-svn-id: svn://svn.chromium.org/blink/trunk@165212 bbb929c8-8fbe-4397-9dbb-9b2b20218538
TimelinePanel: adjust records list if the time window was changed in another view.

BUG=
R=alph@chromium.org, pfeldman@chromium.org

Review URL: https://codereview.chromium.org/135523004

git-svn-id: svn://svn.chromium.org/blink/trunk@165214 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add testharness.js based tests for ensuring correct ligature linebreaking

Permission for using MEgalopolis Font from Jack Usine was retrieved.

BUG=331514
R=dpranke,eae

Review URL: https://codereview.chromium.org/136523003

git-svn-id: svn://svn.chromium.org/blink/trunk@165215 bbb929c8-8fbe-4397-9dbb-9b2b20218538