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This will help us better understand the perf difference between users
who encounter pages with OOPIFs and users who don't.

Bug: 946575
Change-Id: I021d1759f0c3c5b0863b9230d5f8d8aacad47e2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625842
Auto-Submit: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662931}