Implement mailing a people search person result.
Implement the first action for people search, at this point just e-mailing them.

R=oshima@chromium.org, xiyuan@chromium.org
BUG=285575

Review URL: https://codereview.chromium.org/23727011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224812 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224812