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Regression test for https://crbug.com/1157664. Verifies that opening
a menu via long-press on a tab does not result in a popup window with
empty bounds. In production this bug caused a Wayland protocol error
and lacros crash.

Adds a new test crosapi to inject touch events from the ash side.
See comments in test for why we do it this way.

I verified that this test fails appropriately when the fix for the
original bug is reverted. The test does not reproduce the Wayland
protocol error, because that error is in code that only runs when
graphics overlay forwarding is enabled, which only happens on
device. However, it's sufficient for the test to verify that the
popup in lacros has non-empty bounds.

Bug: 1157664
Test: lacros_chrome_browsertests

Change-Id: Ia8aabaec1d6ec4bc72d1e77eda9a7f0efbe5f0c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643026
Commit-Queue: James Cook <jamescook@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846264}