#55653: test: fix shared texture spec flakes and disable retries
Merged
Description of Change
Fixes #55391.
Disables retries for the shared-texture suite and fixes first-run failures by:
- Waiting for the receiving frame’s WebGPU setup and texture receiver before transferring textures.
- Waiting for source loading and GPU rendering instead of using a fixed capture delay.
- Scaling the reference image to match the captured pixel dimensions.
- Surfacing renderer errors and pixel mismatches immediately instead of masking them as timeouts.
Checklist
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npm testpasses - tests are changed or added
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