fix: populate phase of WebMouseWheelEvents in webContents.sendInputEvent

[ppontes]

When wheel scroll latching and async wheel events are enabled, phase information gets added to WebMouseWheelEvents when they are generated from native events. Chromium expects this information to be available and asserts that expectation with a DCHECK. Phase information must be synthesized and set to a WebMouseWheelEvent that is generated with webContents.sendInputEvent or a DCHECK will fail in Chromium.

The very same problem was found and fixed in Chromium for the simulation of mouse wheel events from the devtools. See ticket and fix commit. This is basically a port of that fix to webContents.sendInputEvent.

This makes it possible to run the test in this PR.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Using webContents.sendInputEvent to send a WebMouseWheelEvent now has the expected effect.

[alexeykuzmin]

Using webContents.sendInputEvent to send a WebMouseWheelEvent no longer fails a Chromium pre-condition, which was causing a failed DCHECK in debug builds.

Are there any changes noticeable by users?

[ppontes]

@alexeykuzmin updated the release note to be more relevant to users.

[release-clerk]

Release Notes Persisted

Using webContents.sendInputEvent to send a WebMouseWheelEvent now has the expected effect.

[miniak]

/trop run backport-to 4-2-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "4-2-x" here we go! :D

[miniak]

/trop run backport-to 5-0-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "5-0-x" here we go! :D

[trop]

I have automatically backported this PR to "4-2-x", please check out #18494

[miniak]

/trop run backport-to 6-0-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "6-0-x" here we go! :D

[trop]

I have automatically backported this PR to "5-0-x", please check out #18495

[trop]

I was unable to backport this PR to "6-0-x" cleanly;
you will need to perform this backport manually.