Don't cancel compositor animations that are setting start time  from the compositor.

Animations that are started on the compositor take their start time from the compositor
rather than setting it directly. This patch prevents the compositor update of main-thread
start time from cancelling the animation on the compositor.

BUG=361609

Review URL: https://codereview.chromium.org/233893006

git-svn-id: svn://svn.chromium.org/blink/trunk@171329 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix filepath tests for EncodingError

As the issue on the management of dot-dot-dot path sequences has been
solved, this change re-enables and fixes the filepath  tests and removes
the corresponding FIXMEs.

BUG=181617

Review URL: https://codereview.chromium.org/227093003

git-svn-id: svn://svn.chromium.org/blink/trunk@171330 bbb929c8-8fbe-4397-9dbb-9b2b20218538