tree a1b59255f4ffc23c9f66b50961d55263addc1790
parent c24e3f313b2bbd1f3d782a3eec9a7d5fea67dbd9
author Bruno Rocha <bpontes@google.com> 1315863084 -0700
committer Bruno Pontes Soares Rocha <bpontes@chromium.org> 1316123807 -0700

Add UMA metrics for detecting and reporting update certificate changes.

LibcurlHttpFetcher checks if the update server certificate has changed
since last update, and stores an eventual report in prefs. UpdateCheckScheduler
submits to UMA reports from the previous update.

BUG=chromium-os:19842
TEST=Included unittest for the new class and tested locally on an Alex device,
since we need to verify against the actual server certificates.

Change-Id: I5bee5d648982cd7618db09b67d5bff377eaa1fc1
Reviewed-on: http://gerrit.chromium.org/gerrit/7565
Reviewed-by: Bruno Pontes Soares Rocha <bpontes@chromium.org>
Tested-by: Bruno Pontes Soares Rocha <bpontes@chromium.org>
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>