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AverageLagTracker::AddLatencyInFrame is already logically splited
(most part of its body is inside an if/else body) into 2 cases:
ScrollBegin and ScrollUpdate. This CL aims to create a method
for each case so AddLatencyInFrame is leaner and simpler to read.

Also, as this class in being refactored at
https://chromium-review.googlesource.com/c/chromium/src/+/2189633
this simple refactor will reduce the amount of noise created by
CL #2189633.


Bug: 1079024, 1079028
Change-Id: I7c9d2567ac3a875ca4c03b33d77a7a169bbb6375
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216707Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Daniel Libby <dlibby@microsoft.com>
Commit-Queue: João Victor Almeida de Aguiar <joalmei@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#774708}