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Encrypted media streams may contain unencrypted flames. That case wasn't
handled correctly in FuchsiaSecureStreamDecryptor. Now it generates
input packet with a single subsample entry with encrypted_bytes = 0.

fuchsia.media.drm API currently needs key_id even for clear frames,
see fxb/38253. To workaround this bug FuchsiaSecureStreamDecryptor now
stores a key_id from the last OnNewKey() and then sets that key_id in
the FormatDetails for clear frames.

Bug: 1012525, b/141148085
Change-Id: I185e3a89086a3613b383b9ef75e59ef5e151cb75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846323
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704874}