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if
a) the mouse event is not captured, or
b) even if captured, it's considered a plain click.

  see bug for repro step.

Bug: 900614
Test: updated tests to match this expectation. Also tested manually.
Change-Id: I2668fa5692a0e4381e72d2d22bf5543914a8ca34
Reviewed-on: https://chromium-review.googlesource.com/c/1328709
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607431}