Add brushedBinRange and mergeSampleDiagnostics to histogram-span.
Add brushedBinRange and mergeSampleDiagnostics to histogram-span.

They will be synchronized to HistogramSetTableCellState:
https://codereview.chromium.org/2747453003

No functional changes.

BUG=catapult:#3289

Review-Url: https://codereview.chromium.org/2778453004

catapult-project/catapult-csm,benschmaus/catapult,sahiljain/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult,sahiljain/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,sahiljain/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult-csm,sahiljain/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult,sahiljain/catapult,catapult-project/catapult-csm,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult