Adds a counter for @-webkit-region rule.

@region rule replaced by ::region() functional pseudo-element in http://www.w3.org/TR/css3-regions/

BUG=

Review URL: https://codereview.chromium.org/78773002

git-svn-id: svn://svn.chromium.org/blink/trunk@162406 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r162392

http://src.chromium.org/viewvc/blink?view=revision&revision=162392

TBR=vollick@chromium.org

Review URL: https://codereview.chromium.org/79033003

git-svn-id: svn://svn.chromium.org/blink/trunk@162407 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add a missing null check in HistoryController::createItemTree

When pushState() is called, sometimes a history item doesn't exist for that
frame. In that case, we blindly try to acces the null HistoryItem*.

Unfortunately, I haven't been able to determine the exact case where this
occurs, so no new test.

BUG=321608

Review URL: https://codereview.chromium.org/79223002

git-svn-id: svn://svn.chromium.org/blink/trunk@162408 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix typo in port.filesystem -> port._filesystem.

Sigh. Maybe later today I'll start working on more unit tests ...

TBR=peter@chromium.org

Review URL: https://codereview.chromium.org/78833004

git-svn-id: svn://svn.chromium.org/blink/trunk@162409 bbb929c8-8fbe-4397-9dbb-9b2b20218538