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This CL changes how |sampleRate| in AudioWorkletGlobalScope is updated.

Previously, the sample rate was updated when the first processor was
created, thus accessing the sample rate in the class definition phase
gives 0 value. With this CL, the sample rate is initialized as soon
as the global scope is created, before the script is loaded/parsed.

Bug: 815313
Test: http/tests/webaudio/audio-worklet/global-sample-rate.html
Change-Id: I994ee70c10ed93618b28c7d29df42b5d458c74f8
Reviewed-on: https://chromium-review.googlesource.com/935747
Commit-Queue: Hongchan Choi <hongchan@chromium.org>
Reviewed-by: Raymond Toy <rtoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539254}