Stop propagation of key events in the find control
Stop propagation of key events in the find control

This fixes that key events in the find control also affect the
TimelineTrackView, e.g using arrows and shift key.

BUG=
R=dsinclair@chromium.org

Review URL: https://codereview.appspot.com/12956048
catapult-project/catapult,danbeam/catapult,dstockwell/catapult,sahiljain/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult-csm,0x90sled/catapult,catapult-project/catapult,sahiljain/catapult,0x90sled/catapult,catapult-project/catapult,scottmcmaster/catapult,SummerLW/Perf-Insight-Report,dstockwell/catapult,benschmaus/catapult,catapult-project/catapult,zeptonaut/catapult,danbeam/catapult,modulexcite/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult-csm,0x90sled/catapult,sahiljain/catapult,scottmcmaster/catapult,vmpstr/trace-viewer,dstockwell/catapult,zeptonaut/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,scottmcmaster/catapult,dstockwell/catapult,vmpstr/trace-viewer,modulexcite/catapult,benschmaus/catapult,modulexcite/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,vmpstr/trace-viewer,benschmaus/catapult,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult,sahiljain/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,zeptonaut/catapult,danbeam/catapult,SummerLW/Perf-Insight-Report,sahiljain/catapult,danbeam/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult