Allow file:/// access to the Downloads folders in multi-profile sessions.

We have been whitelisted 'file:///home/chronos/user/Downloads'
on Chrome OS, but the third component may vary from "user"
when multiple profiles are logged into a session.

BUG=309556

Review URL: https://codereview.chromium.org/54053004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232751 0039d316-1c4b-4281-b951-d872f2087c98
[Telemetry] Session restore benchmark shouldn't start clock before browser load

The CPU usage measurements for the session restore benchmark were being taken before the browser launched on Linux/Windows causing the tests to fail.

This CL starts the timer in the correct place with the browser process properly launched.

BUG=314377

Review URL: https://codereview.chromium.org/56123007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232752 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232752
Record UMA events for actions on the Android NTP.

This records UMA events for actions on the Android NTP (e.g. clicking on
a bookmark), which will be used as part of the time to long dwell
analysis on the NTP. Note: UMA histograms don't contain timestamps, so
we need events instead.

BUG=178932
NOTRY=true
R=mpearson@chromium.org, tedchoc@chromium.org

Review URL: https://codereview.chromium.org/57573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232753 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232753