crash-reporter: Send systemwide stability information up to Chrome

Change-Id: Idcb3dff3b98951b41a55b9f48968c3608b44efae

BUG=9352
TEST=
1) UserCrash
2) Crash random process and verify Chrome indicates "other user" crashes
occurred in its stability UMA data.

Review URL: http://codereview.chromium.org/6138005
1 file changed
tree: 3fc7d5f8e2d0bc734438b0d038e366a3ac0cb87e
  1. crash_reporter/