Bug 1056803 - added nsiAccessibleObjectAttributeChangedEvent interface. Tests included. r=tbsaunde

---
 accessible/base/AccEvent.cpp                       |  8 +++++
 accessible/base/AccEvent.h                         | 29 ++++++++++++++++-
 accessible/generic/DocAccessible.cpp               |  8 +++--
 accessible/interfaces/moz.build                    |  1 +
 .../nsIAccessibleObjectAttributeChangedEvent.idl   | 21 ++++++++++++
 accessible/tests/mochitest/common.js               |  2 ++
 accessible/tests/mochitest/events.js               | 37 ++++++++++++++++++++++
 .../tests/mochitest/events/test_aria_objattr.html  |  7 ++--
 accessible/xpcom/AccEvents.conf                    |  1 +
 9 files changed, 106 insertions(+), 8 deletions(-)
 create mode 100644 accessible/interfaces/nsIAccessibleObjectAttributeChangedEvent.idl