crash-reporter: Generate kernel crash signatures for server-side grouping of similar crashes

BUG=5868
TEST=KernelCrash, UserCrash, CrashSender, unittests, and manual inspection of sent report.

Change-Id: I31991895c9ac719ac1832d588ae3360500ef0c26

Review URL: http://codereview.chromium.org/4018008
11 files changed
tree: c5727796683322b4b05993c714b99828b51d2cfd
  1. crash_reporter/