Move global variable declaration above imports.
Move global variable declaration above imports.

Caused by CL: 1367573005, while I was trying to organize imports.

BUG=#1545

Review URL: https://codereview.chromium.org/1377523004

benschmaus/catapult,catapult-project/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult-csm,sahiljain/catapult,benschmaus/catapult,SummerLW/Perf-Insight-Report,0x90sled/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,benschmaus/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,catapult-project/catapult-csm,0x90sled/catapult,benschmaus/catapult,0x90sled/catapult,sahiljain/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult,sahiljain/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult