Fix use ctrl to zoom in on selection not working for real
Fix use ctrl to zoom in on selection not working for real

TBR=nduca@chromium.org
BUG=

Review URL: https://codereview.appspot.com/13000043
dstockwell/catapult,sahiljain/catapult,danbeam/catapult,danbeam/catapult,vmpstr/trace-viewer,SummerLW/Perf-Insight-Report,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,benschmaus/catapult,zeptonaut/catapult,sahiljain/catapult,catapult-project/catapult-csm,scottmcmaster/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,danbeam/catapult,catapult-project/catapult,benschmaus/catapult,dstockwell/catapult,catapult-project/catapult,catapult-project/catapult-csm,benschmaus/catapult,vmpstr/trace-viewer,scottmcmaster/catapult,danbeam/catapult,catapult-project/catapult-csm,dstockwell/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,dstockwell/catapult,zeptonaut/catapult,catapult-project/catapult,sahiljain/catapult,modulexcite/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,modulexcite/catapult,catapult-project/catapult-csm,catapult-project/catapult,sahiljain/catapult,scottmcmaster/catapult,modulexcite/catapult,vmpstr/trace-viewer,0x90sled/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,0x90sled/catapult,0x90sled/catapult,zeptonaut/catapult,SummerLW/Perf-Insight-Report,sahiljain/catapult