Log when App info or Widgets system shortcuts are tapped

Sample output:
D/UserEvent: action:LONGPRESS
              Source child:APP_ICON, grid(1,3), span(1,1), pageIdx=0	parent:WORKSPACE id=0
              Elapsed container 135 ms session 7984 ms action 0 ms
              isInLandscapeMode false
              isInMultiWindowMode false
D/UserEvent: action:TAP
              Source child:WIDGETS_BUTTON	parent:DEEPSHORTCUTS
              Elapsed container 41 ms session 8906 ms action 0 ms
              isInLandscapeMode false
              isInMultiWindowMode false
D/UserEvent: action:LONGPRESS
              Source child:APP_ICON, grid(1,3), span(1,1), pageIdx=0	parent:WORKSPACE id=0
              Elapsed container 184 ms session 11297 ms action 0 ms
              isInLandscapeMode false
              isInMultiWindowMode false
D/UserEvent: action:TAP
              Source child:APPINFO_TARGET	parent:DEEPSHORTCUTS
              Elapsed container 678 ms session 11976 ms action 0 ms
              isInLandscapeMode false
              isInMultiWindowMode false


Bug: 37430954
Change-Id: I526edbf1eea551eb8eaddbb27e52058804fee874