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The PerformanceManagerTabHelper reflects WebContents and their frame
trees into the PerformanceManager graph. This CL gives the graph
visibility for the ChromeOS login's view.

Bug: 993029
Change-Id: Ie1822ba72f64df9d29084e7bf2c42526273f86e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017928
Auto-Submit: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735663}