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Optional sampleRate parameter to AudioContextOptions, if provided then
the AudioContext will run at this sampleRate, otherwise it will run at
the hardware rate.

Running the AudioContext at a lower sample rate can allow running a
heavier graph on low-end devices, for example if a given device is able
to run with X nodes at a sample rate of 48k, it can support roughly
2X nodes at 24k or 4X nodes at 12k.

Bug: 432248
Change-Id: I835f28b4625763bd6a6ddbee9b89636ef8a8a066
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1482957Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Commit-Queue: Andrew MacPherson <andrew.macpherson@soundtrap.com>
Cr-Commit-Position: refs/heads/master@{#638498}