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This CL adds AwTracingDelegate overrides for IsAllowedToBeginBackgroundScenario()
and IsAllowedToEndBackgroundScenario() which return true to enable
background tracing for WebView.

Bug: b/170511349
Change-Id: I56e306ac37f6d4055b68bf54a5c009111ce31077
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465873
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Michael Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817234}