huangdarwin c5a5364673 HDR: Clarify tone mapping fallback.
createSupportedTransformationRequest is more accurate than
createFallbackTransformationRequest, as a TransformationRequest will be returned
regardless of whether any fallback is applied.

PiperOrigin-RevId: 466641277
2022-09-30 16:29:27 +00:00
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2022-09-30 16:29:27 +00:00