GitLab

This change adds code to enable background tracing in WebView under the
following conditions:
- system tracing is configured
- the config specifies system tracing mode.

Bug: b/170513316
Change-Id: I5a38255a0098d3d91bbdd33facb23df5c9c8f2c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508312
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Michael Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823759}