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In Google Calendar, the "rooms" tab of a new invite triggers a flood of events (location changes, and attribute changes).

The dynamic room dropdown appears to continually be updating itself resulting in thousands of events per second.

This change:
- minimizes the js <-> C++ calls by pushing event listener state to C++ from js
- if there's no event listener for a given event, don't incur the cost of sending it to js
- in ChromeVox, create a new class, RangeAutomationHandler, which installs event listeners scoped as much as possible, to ChromeVox's currentrange. This ignores events on other parts of the tree.

Test: manually on Google Calendar.
Change-Id: I4172f504915665dbe7d0a88df11aefceb36439b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947643
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721217}