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This CL is a continuation of
https://chromium-review.googlesource.com/c/chromium/src/+/1088356.

This CL gives an event target to EventQueueImpl and use it instead of
event->target() so that we can have EventQueueImpl and
MediaElementEventQueue with the same structure.

Design Doc: https://docs.google.com/document/d/1BBtBPTarOF4NeVKSWZe3XaDHo4yTGhdlqYm35yVzPs4/edit#

Bug: 846618
Change-Id: I394e3b1c01df3a2af671bb6d72fe9d32ac9ea94e
Reviewed-on: https://chromium-review.googlesource.com/1098736Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567220}