In addition to the basic proxying, this required some changes to the dispatcher
and process infrastructure to get the handles of the processes available when
I need them so I can duplicate the shared memory handles properly into the
different processes.
TEST=none
BUG=none
Review URL: http://codereview.chromium.org/4985001
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@68026 0039d316-1c4b-4281-b951-d872f2087c98