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Per the Core-AAM specification, buttons with non-false values for
aria-haspopup should report as a UIA "button" control.

This change also ensures that GetPropertyValue reports the value for
UIA_ExpandCollapseExpandCollapseStatePropertyId when requested (this
ensures that property-change events get the new-value correctly).

Bug: 1048821
Change-Id: I0b222480ec76f9a0989658ded3fab0952f34822c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037822Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Ian Prest <iapres@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#738806}