Allow clicking on the mode indicator to toggle modes.
Allow clicking on the mode indicator to toggle modes.

BUG=305

Review URL: https://codereview.appspot.com/10832044
sahiljain/catapult,zeptonaut/catapult,zeptonaut/catapult,catapult-project/catapult-csm,sahiljain/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,danbeam/catapult,catapult-project/catapult,catapult-project/catapult-csm,sahiljain/catapult,vmpstr/trace-viewer,benschmaus/catapult,benschmaus/catapult,modulexcite/catapult,0x90sled/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,benschmaus/catapult,dstockwell/catapult,dstockwell/catapult,catapult-project/catapult-csm,catapult-project/catapult,zeptonaut/catapult,benschmaus/catapult,scottmcmaster/catapult,dstockwell/catapult,catapult-project/catapult,catapult-project/catapult,dstockwell/catapult,catapult-project/catapult,vmpstr/trace-viewer,0x90sled/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,sahiljain/catapult,sahiljain/catapult,benschmaus/catapult,catapult-project/catapult,SummerLW/Perf-Insight-Report,danbeam/catapult,catapult-project/catapult-csm,danbeam/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,0x90sled/catapult,scottmcmaster/catapult,SummerLW/Perf-Insight-Report,vmpstr/trace-viewer,SummerLW/Perf-Insight-Report,danbeam/catapult,modulexcite/catapult,scottmcmaster/catapult,modulexcite/catapult