Summary:
Singleline <TextInput> now has intrinsic size which is equal to size of placeholder.
And if <TextInput> does not have placeholder it still has intrinsic height.
So, we don't need to set the size up manually every single time anymore!
(Multiline <TextInput> already has this feature.)
Reviewed By: mmmulani
Differential Revision: D5069971
fbshipit-source-id: f65c1062a812259b66d287929314dc571dc1f3ee