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Pass mouse events to chromevox's mouse_handler.js, and fire hover
events on mousemove. This allows mousemove events to cause spoken
feedback using the same functions as touch exploration. Mouse events
are only rewritten if the chromevox option speakTextUnderMouse is
enabled.

Note: chromevox only receives mousemove events when the mouse is down.
Temporarily, this functionality is used by holding the mouse button
down and moving the pointer around the page.

Bug: 853581

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I2feb14a1f5d765296fde9a923b862c99f45b41bb
Reviewed-on: https://chromium-review.googlesource.com/c/1234260Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: James Wallace-Lee <jamwalla@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597240}