This change adds FrameDecryptorInterface::Result to the FrameDecryptorInterface API. Result contains a Status and bytes_written. This removes requiring out parameters from the API and provides a simpler status return code for the function. This is in response to comments suggested here: https://webrtc-review.googlesource.com/c/src/+/131358 int FrameDecryptorInterface::Decrypt() will be removed in a follow up CL. Bug: webrtc:10512 Change-Id: I47f19f154d1d8430acd6e4a6f433ab24c455fd51 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131362 Commit-Queue: Benjamin Wright <benwright@webrtc.org> Reviewed-by: Steve Anton <steveanton@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27470}