Fix wda crash when scrolling
Fix wda crash when scrolling

Summary: Unfortunately when using CGFloat WDA crashes, which probably meas there is type mismatch.

Reviewed By: mmmulani

Differential Revision: D3174141

fb-gh-sync-id: 87b3a731b8e1137367d0e5375c91c62e2bd74f55
fbshipit-source-id: 87b3a731b8e1137367d0e5375c91c62e2bd74f55

qa-dev/WebDriverAgent,drptbl/WebDriverAgent,zenzhu/WebDriverAgent,b1ueshad0w/WebDriverAgent,riccoyu/WebDriverAgent,riccoyu/WebDriverAgent,calabash/WebDriverAgent,b1ueshad0w/WebDriverAgent,PiranhaTeam/WebDriverAgent,qa-dev/WebDriverAgent,calabash/WebDriverAgent,rafael-chavez/WebDriverAgent,ymin/WebDriverAgent,Gogle/WebDriverAgent,Gogle/WebDriverAgent,zenzhu/WebDriverAgent,Gogle/WebDriverAgent,calabash/WebDriverAgent,rafael-chavez/WebDriverAgent,zenzhu/WebDriverAgent,Gogle/WebDriverAgent,PiranhaTeam/WebDriverAgent,PiranhaTeam/WebDriverAgent,b1ueshad0w/WebDriverAgent,b1ueshad0w/WebDriverAgent,drptbl/WebDriverAgent,riccoyu/WebDriverAgent,PiranhaTeam/WebDriverAgent,ymin/WebDriverAgent,ymin/WebDriverAgent,drptbl/WebDriverAgent,rafael-chavez/WebDriverAgent,qa-dev/WebDriverAgent,PiranhaTeam/WebDriverAgent,qa-dev/WebDriverAgent,riccoyu/WebDriverAgent,ymin/WebDriverAgent