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AudioRendererAlgorithm may use resampler depending on playback rate.
When using the resampler audio samples may be buffered in
AudioRendererAlgorithm itself as well as in the resampler.
frames_buffered() was returning only number of frames buffered
internally, without accounting for the buffers in the resampler.
Replaced it with BufferedFrames() that adds the buffers in the
resampler.

Bug: b/150247610
Change-Id: Iacc5e8914f086f5298ecc7120ab369bd32ea5a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2113808
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752720}