[CP] Fix incorrect depth in drawPoints rendering.

[jonahwilliams]

Issue Link

#160343

Target

stable

Cherry pick PR Link

flutter/engine#57248

Changelog Description

• Fix incorrect Z order rendering in drawPoints

Impacted Users

All Android/iOS users with drawPoints

Impact Description

Multiple lines drawn with drawPoints may overlap content that should be visually in front of it.

Workaround

Split different line segments into different draw calls.

Risk

low

Test Coverage

yes

Validation Steps

Run the attached application.

[github-actions]

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