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Previously, the Cast Streaming Session would be ended after either the
audio or video stream received no data for 15s. However, some Cast
Streaming Senders sometimes do not send video data for longer than
that when there is no video update to send, resulting in the session
being prematurely ended.

This changes the Cast Streaming Receiver behavior to only end the
session if no audio and no video data is received for 15 seconds. As
a result, the frame duration has been changed to 10 minutes to prevent
a demuxer underflow in the Chrome media pipeline, resulting in delayed
playback.

Bug: 1166371, b/172139177
Change-Id: I2f66ca009bdedb00ae79ac8e9dda8cc2ebcd16af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617363
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843227}