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For each frame there is only one blink_breakdown and viz_breakdown, so
From all stage_data in the stage_history_ only one has viz_breakdown,
and only one has blink breakdown. This means that the breakdowns can be
part of the reporter instead of the stage_data.

Bug=none

Change-Id: I1448ecd539a7cb480fef5d0744efc76ff517b5dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940386Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720278}