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The PerformanceManagerTabHelper reflects WebContents and their frame
trees into the PerformanceManager graph. This CL gives the graph
visibility for the WebContents created by ChromeWebDialogView.

Bug: 1046881
Change-Id: I0b60996a1883a3be5f85f505576e1618ad347061
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036479Reviewed-by: Collin Baker <collinbaker@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738000}