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This CL adds the initial set of benchmark tests designed for Web
Audio API. For the technical detail, see go/webaudio-perf
(googler-only).

Bug: 1052424
Change-Id: Id1ff5ac7c3a197f49e78965478f78fd2a82fa073
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064824Reviewed-by: Raymond Toy <rtoy@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758712}