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This change plumbs through the idea of a generated event type directly onto the AutomationEvent interface. GeneratedEvents are those defined in ui/accessibility/ax_event_generator.h.

This is a straight-forward way for chrome.automation to make use of the underlying data.

Note also that future authors can add additional events to chrome.automation.GeneratedEventType without touching ax::mojom::Event or ui::AXEventGenerator::Event. We only enforce that all ui::AXEventGenerator::Event types are in chrome.automation.GeneratedEventType, but not the reverse.

See the fixed bug for an application of this change.

Test: manually and browser_tests --gtest_filter=ChromeVox*.SortDirection.
Fixed: 1112983
AX-relnotes: adds support for aria-sort output in ChromeVox.

Change-Id: I27a34e988ce7ca8988ab2ee177e9022b7bc54610
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353704
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801041}