Sheriffbot should explain rollout failures in a human readable form.
https://bugs.webkit.org/show_bug.cgi?id=107092

Patch by Alan Cutter <alancutter@chromium.org> on 2013-03-26
Reviewed by Ryosuke Niwa.

Improved sheriffbot's error reporting when a rollout command fails to reverse diff files (the most common failure).

* Scripts/webkitpy/tool/bot/irc_command.py:
(Rollout._check_diff_failure):
(Rollout.execute):
* Scripts/webkitpy/tool/bot/irc_command_unittest.py:
(IRCCommandTest.test_rollout):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146861 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[Qt] Unreviewed gardening. Rebaselining after r146814.

* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-clipping-ancestor-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-fixed-positioned-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-opacity-transition-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-overflow-root-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-positioned-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-positioned-transition-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-transformed-expected.txt:
* platform/qt-5.0-wk1/compositing/geometry/limit-layer-bounds-transformed-overflow-expected.txt:
* platform/qt-5.0-wk1/compositing/layer-creation/scroll-partial-update-expected.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146862 268f45cc-cd09-0410-ab3c-d52691b4dbfc