GitLab

Implement FuchsiaDecryptor (audio part) with StreamProcessor.

This CL also copies logic from FuchsiaVideoDecoder into
StreamProcessorHelper and SysmemBufferPool.

StreamProcessorHelper is a wrapper for StreamProcessor.

BufferPool is a wrapper of BufferCollection.

Caller is expected to create and own input/output BufferPool in its own
class and interact with StreamProcessorHelper by buffer index.

The new classes will be shared between FuchsiaVideoDecoder and
FuchsiaDecryptor in the future.

component successfully.

Bug: 966191
Test: Shaka player demo "Dig the Uke", log shows connecting to fuchsia
Change-Id: Ia0bd63e9ff39eaf4b6f477ac542fcbefe9c86e46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764179Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694024}