Make text in the analysis area selectable.
Make text in the analysis area selectable.

BUG=24
TEST=select slice, counter, etc; select text from anaylsis area

Review URL: https://codereview.appspot.com/6301091
sahiljain/catapult,catapult-project/catapult-csm,danbeam/catapult,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult,danbeam/catapult,catapult-project/catapult,vmpstr/trace-viewer,zeptonaut/catapult,benschmaus/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,modulexcite/catapult,vmpstr/trace-viewer,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult,dstockwell/catapult,benschmaus/catapult,danbeam/catapult,vmpstr/trace-viewer,catapult-project/catapult-csm,0x90sled/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult-csm,dstockwell/catapult,SummerLW/Perf-Insight-Report,SummerLW/Perf-Insight-Report,SummerLW/Perf-Insight-Report,catapult-project/catapult,scottmcmaster/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,scottmcmaster/catapult,scottmcmaster/catapult,zeptonaut/catapult,sahiljain/catapult,zeptonaut/catapult,SummerLW/Perf-Insight-Report,danbeam/catapult,0x90sled/catapult,catapult-project/catapult-csm,dstockwell/catapult,sahiljain/catapult,catapult-project/catapult,sahiljain/catapult,dstockwell/catapult,modulexcite/catapult,0x90sled/catapult,modulexcite/catapult,benschmaus/catapult,catapult-project/catapult