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Extends the external_metrics interface to recognize a new metric kind (crash) which gives a string to describe which kind of crash.  We handle three currently non-Chrome user space crashes, kernel crashes, and unclean system shutdowns.  These are accumulated, but not yet put into xml uploads until the server side is ready.

BUG=chromium-os:9352
TEST=unit_tests and tested in chromeos that log messages were generated corresponding with crashes.

Review URL: http://codereview.chromium.org/6077013
Patch from Ken Mixter <kmixter@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72154 0039d316-1c4b-4281-b951-d872f2087c98