Add histograms to record form activity for "evicted and reloaded" tabs.

The two histograms record the total amount of form activity and the
time since the most recent form activity.

BUG=None

Review URL: https://codereview.chromium.org/129873017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246695 0039d316-1c4b-4281-b951-d872f2087c98
[Android] Use correct profile for the account management screen.

We don't need to use GetLastUsedProfile() here as we have
the web contents.

BUG=316637

Review URL: https://codereview.chromium.org/131103014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246696 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246695
SVN changes up to revision 246696