DevTools: make timeline's memory statistics use SplitView.

R=caseq@chromium.org

Review URL: https://codereview.chromium.org/63543003

git-svn-id: svn://svn.chromium.org/blink/trunk@161732 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark grid-item-z-index-stacking-context.html as flaky on windows

TBR=jchaffraix@chromium.org
BUG=317742

Review URL: https://codereview.chromium.org/61713003

git-svn-id: svn://svn.chromium.org/blink/trunk@161733 bbb929c8-8fbe-4397-9dbb-9b2b20218538