Make scroll offset type of float in cc

ui/gfx/geometry/safe_integer_conversions.h

Index: ui/gfx/geometry/safe_integer_conversions.h
diff --git a/ui/gfx/geometry/safe_integer_conversions.h b/ui/gfx/geometry/safe_integer_conversions.h
index 4d289ecabafb665386b25ea58704cea22d737440..58ed2a9336ea12a2d2e632d13b50851cdcad83b8 100644
--- a/ui/gfx/geometry/safe_integer_conversions.h
+++ b/ui/gfx/geometry/safe_integer_conversions.h
@@ -30,6 +30,14 @@ inline int ToCeiledInt(float value) {
   return ClampToInt(std::ceil(value));
 }
 
+inline int ToFlooredInt(double value) {
+  return ClampToInt(std::floor(value));
+}
+
+inline int ToCeiledInt(double value) {
+  return ClampToInt(std::ceil(value));
+}
+
 inline int ToRoundedInt(float value) {
   float rounded;
   if (value >= 0.0f)