Path clipping fails on webkit when child and path is outside screen bounds due to transform.

[ferhatb]

<div clip-path=... width="100px" height="100px; position:absolute">
     <div style="transform=translate(-50, 100); width=200px; height=200px; position=absolute;">
        <img>

clips image incorrectly in webkit. Changing translation on inner div shifts clipped area although clip space units are object bounds and positions are absolute.

Steps to Reproduce

flutter/engine#25520 uses oval to fix specific repro case.

Potential fixes/workarounds

Use absolute coordinates instead of objectBounds for clip space units.
Create static html for repro and file bug report with webkit.