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No behavior change intended, just pushing some code into the function
from the callsite. This will allow Mac to use the same interface, but
with mouse events targeting widgets instead of aura::Windows.

Bug: 769352
Change-Id: Ibfec8c567b6e28b1d9b77bf6a7c388e1b69e3395
Reviewed-on: https://chromium-review.googlesource.com/1237115
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594718}