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Missedframe histograms are for the case that we do not present frame or
replaced a reporter by another.
Unit test is updated to reflect this change.



Bug: chromium:1010927
Change-Id: I0b1dd14d53ba7d17bfa92db6261e3cce6e2da8d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836987
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703325}