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This CL moves functions related to getting background tracing
configuration from field trials out of //chrome into
//content/public/browser (BackgroundTracingManager) so that they can be
reused by other embedders (in this case, android_webview).

Bug: b/170511922
Change-Id: Ia4ffc5f84472d9af00a3b84460d3815b360593eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473057
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821363}