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We are adding a new metrics related to back-forward cache e.g., first
input delay after back-forward cache navigation happens. This CL is a
preparation for that change.

Bug: 1014174
Change-Id: I38549e4acb0659877bcd3aa976f0697a596e45dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246360
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780213}