Posix: implement diagnostics mode console output.
Posix: implement diagnostics mode console output.

BUG=42894,42345
TEST=chrome --diagnostics

Review URL: http://codereview.chromium.org/2115001

git-svn-id: http://src.chromium.org/svn/trunk/src@47348 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9e09bee2e4330c1ba5f24e1a1975cca5c2c3f80a
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser