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This is needed to have access to MenuButtonController::PressedLock and ToolbarActionView assumes that this will exist for a popup's reference button.

Bug: 995448
Change-Id: I4855d4e30c38d530c6e8eadf7047ddc518258977
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919660Reviewed-by: Dana Fried <dfried@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715969}