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EasyResizeWindowTargeter only works if a targeter is not installed on the
children of the container. This makes EasyResizeWindowTargeter work by
explicitly checking the parent's WindowTargeter for
SubtreeShouldBeExploredForEvent().

BUG=877099
TEST=covered by test

Change-Id: If5de972623bfbffb87986958010f7c8c51d8b448
Reviewed-on: https://chromium-review.googlesource.com/1187625Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585891}