Add a big grab bag of missing web accessibility
functionality on Windows. (Much of this will benefit
Mac in a future changelist.) Improvements include
dozens of corrected roles and states for various
elements, improved support for tables with rowspan
and colspan, range control support, and live region
support.

Also adds a new command-line flag to turn on
logging of accessibility events, to help making
this type of bug fixing much easier in the future.

BUG=89181,89185,89187,89188,89202,89205,89210,89212,89213,89223
TEST=Manual testing with JAWS, NVDA, AViewer, and accProbe.
Review URL: http://codereview.chromium.org/7745035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99161 0039d316-1c4b-4281-b951-d872f2087c98
20 files changed