DevTools Timeline: show frame bars and delimiters on flame chart

BUG=398789

Review URL: https://codereview.chromium.org/426263003

git-svn-id: svn://svn.chromium.org/blink/trunk@179295 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Avoid crashes in MemoryCache-related tests.

r179210 added GC to runHelper(). However it exposed MemoryCache-related bugs in
Oilpan. We'll investigate the root cause soon.

BUG=393516
TBR=yhirano@chromium.org,oilpan-reviews@chromium.org

Review URL: https://codereview.chromium.org/437503002

git-svn-id: svn://svn.chromium.org/blink/trunk@179296 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark http/tests/media/media-source/mediasource-append-buffer.html as flaky

Flakiness most likely due to change: https://codereview.chromium.org/419673007

TBR=prabhur@chromium.org,wolenetz@chromium.org,acolwell@chromium.org
NOTRY=TRUE
BUG=399188

Review URL: https://codereview.chromium.org/433773002

git-svn-id: svn://svn.chromium.org/blink/trunk@179297 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add UseCounters for non-standard UIEvent IDL attributes

R=rbyers@chromium.org

Review URL: https://codereview.chromium.org/425263007

git-svn-id: svn://svn.chromium.org/blink/trunk@179298 bbb929c8-8fbe-4397-9dbb-9b2b20218538