Forward BrowserAccessibility get_accRole to AXPlatformNode.
This is another migration from BrowserAccessibility to AXPlatformNodeWin.
In this installment, we're converting get_accRole. I have updated the
AXPlatformNodeWin::MSAARole() to include many of the missing roles that
the BrowserAccessibility code had. I also introduced a new method that
allows get_accRole to return a string (overriding the default type value
that MSAARole() returns). I have not dug into why we need to return the
various values instead of just using the role number or html element
name. Instead, I just added todos for me to follow up on.
BUG=703369
Review-Url: https://codereview.chromium.org/2909853002
Cr-Commit-Position: refs/heads/master@{#475757}
3 files changed
