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Registers binders to allow UkmRecorderInterface to be used in worker
contexts. As these binders are not currently registered, calling
WorkerGlobalScope::UkmRecorder() causes a renderer crash. This can occur
when MediaSource::isTypeSupported() is called in a dedicated worker
context (with experimental web features enabled).

Bug: 1122971
Change-Id: If79cbd74cf7d88c66a9fc0eda820c60b682dc5a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424504Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809776}