[Webkit-unassigned] [Bug 216860] [GPU Process] fast/canvas/canvas-blend-image.html and fast/canvas/canvas-blend-solid.html fail on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216860

--- Comment #1 from Wenson Hsieh <wenson_hsieh at apple.com> ---
Super simple test case:

```
<canvas width="1" height="1"></canvas>
<script>
let canvas = document.querySelector("canvas");
let context = canvas.getContext("2d");
context.fillStyle = "red";
context.fillRect(0, 0, 1, 1);

let data = context.getImageData(0, 0, 1, 1);
document.write(`This is solid red (RGBA): ${data.data[0]}, ${data.data[1]}, ${data.data[2]}, ${data.data[3]}`);
</script>
```

This is expected to output “This is solid red (RGBA): 255, 0, 0, 255”. However, when forcing unaccelerated remote image buffers using the GPU process, we get this instead:

“This is solid red (RGBA): 0, 0, 255, 255”

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