Initialize Visible Rect, Orientation, and Display Size can produce a zero display dimension

In the https://w3c.github.io/webcodecs/#videoframe-initialize-visible-rect-orientation-and-display-size algorithm, steps 8.3–8.4 compute the display size by scaling from the source frame:

...
  3. Let |displayWidth| be frame's [[visible width]] * widthScale, rounded to the nearest integer.
  4. Let |displayHeight| be frame's [[visible height]] * heightScale, rounded to the nearest integer.
...

If the source frame has a very small display dimension relative to its visible size, the scaling and rounding can produce zero. For example:

  const f0 = new VideoFrame(canvas, { timestamp: 0, displayWidth: 1280, displayHeight: 1 })
  // f0: visibleRect = {0,0,300,150}, displaySize = {1280,1}

  const f1 = new VideoFrame(f0, { visibleRect: { width: 187, height: 40 } })
  // heightScale = 1/150 ≈ 0.00667
  // displayHeight = round(0.00667 * 40) = round(0.267) = 0  ← zero!

I think we should reject this, the resulting f1 has a display height of 0, which is an invalid state: [[display height]] of 0 is explicitly rejected by Validate VideoFrameInit ... when provided explicitly (step 4), but not when computed implicitly -- but our intent is clear.

We should just throw the same error.

Start with the WebCodecs “Initialize Visible Rect, Orientation, and Display Size” algorithm, especially steps 8.3–8.4, and compare its implicit sizing with the “Validate VideoFrameInit” zero-dimension check. Confirm the expected behavior for the supplied VideoFrame example and update the specification so the result cannot retain a zero display dimension.