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This enables the reportedByPageMetric for system health and v8 browsing
benchmarks.

Bug: 1007178
Change-Id: I1ba85f6984c7a3db257595c369d13759d3180f42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831808Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703274}