Attempt to deflake some animation tests

TBR=shans

Review URL: https://codereview.chromium.org/179753002

git-svn-id: svn://svn.chromium.org/blink/trunk@167788 bbb929c8-8fbe-4397-9dbb-9b2b20218538
TimelinePanel: MemoryStatistics: mouse cursor position is incorrect in dock to right mode.

BUG=346699
R=yurys@chromium.org

Review URL: https://codereview.chromium.org/176963012

git-svn-id: svn://svn.chromium.org/blink/trunk@167789 bbb929c8-8fbe-4397-9dbb-9b2b20218538