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Since the background tracing trial names are different for Chrome and
WebView, this change makes the trial name a parameter of
BackgroundTracingManager::GetBackgroundTracingConfig().

Bug: b/170513316
Change-Id: I963d6d34e87d70633fab9cfda36d96ba8ab770f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523904
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Michael Bai <michaelbai@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825959}