Test harness and tests for CSSOM View smooth scroll

This adds a ScrollBehaviorTest class and tests using this class.

BUG=243871

Review URL: https://codereview.chromium.org/378953002

git-svn-id: svn://svn.chromium.org/blink/trunk@177797 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove no-longer-flaky access-control-basic-get-fail-non-simple.html tests from TestExpectations

BUG=391391,391299
NOTRY=true
R=yhirano@chromium.org

Review URL: https://codereview.chromium.org/382723002

git-svn-id: svn://svn.chromium.org/blink/trunk@177798 bbb929c8-8fbe-4397-9dbb-9b2b20218538