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This CL fixes an issue where the LongPress InProductHelp wasn't
displayed after displaying the BottomToolbar help as the event was
registered.
This CL registers the bottom_toolbar_opened event when the tip is shown.
It also fixes a couple a minor issues in the bubble presenter.

Bug: 877004
TBR: nyquist@chromium.org
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Id8c3906c6026ae84d1de09d9c953c2cea887f81d
Reviewed-on: https://chromium-review.googlesource.com/1186410Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585755}