Round text size to closest larger pixel size

Summary:
Changelog: [Internal]

Round calculated text size to closest larger pixel size.
In Paper we do this as well in https://fburl.com/diffusion/w2pj6ea0

Why do we need this?
For example, we calculate height of the text to be 16.707235, yoga takes this value and assigns text to have height 17 anyway.
I assume Yoga uses this extra 0.3 points of height to move other things around a little bit because Yoga doesn't deal with exact values.

Reviewed By: shergin

Differential Revision: D21999032

fbshipit-source-id: 73923dc3e27fa110adb3f76cfa635e0bfdc672d4

ReactCommon/fabric/textlayoutmanager/platform/ios/RCTTextLayoutManager.mm

@@ -10,6 +10,7 @@
 #import "NSTextStorage+FontScaling.h"
 #import "RCTAttributedTextUtils.h"
 
+#import <React/RCTUtils.h>
 #import <react/utils/ManagedObjectWrapper.h>
 #import <react/utils/SimpleThreadSafeCache.h>
 
@@ -56,6 +57,8 @@ static NSLineBreakMode RCTNSLineBreakModeFromEllipsizeMode(EllipsizeMode ellipsi
 
   CGSize size = [layoutManager usedRectForTextContainer:textContainer].size;
 
+  size = (CGSize){RCTCeilPixelValue(size.width), RCTCeilPixelValue(size.height)};
+
   __block auto attachments = TextMeasurement::Attachments{};
 
   [textStorage