bb2f28a776
TYPE_WINDOWS_CHANGED events have meant that "something" changes with the system windows, so a single event would be fired for a single small window change or a bunch of window changes. Services were required to cache the windows and compare the old ones to the new ones to find out what changed. Since AccessibilityEvents are intended to communicate changes to the UI, this CL sends one TYPE_WINDOWS_CHANGED for each window that has changed, and provides a way to get the source of the changing window. It also adds a windowChangeType field, which contains flags to indicate what exactly has changed for the window. Bug: 62231686 Test: Run all a11y unit and cts tests Change-Id: I6c48e74da26be5ea485ac114a37f3c404a74940e