Introduced -[RCTShadowView contentFrame]

Summary:
Another trivial sugar/helper to access computed by Yoga layout metrics.
We will use it soon in the new Text render/layout engine.

Reviewed By: mmmulani

Differential Revision: D6671979

fbshipit-source-id: d36933415c2fa50bae5cc171434d8f0b281955b7

React/Views/RCTShadowView+Layout.h

@@ -26,6 +26,7 @@ RCT_EXTERN CGFloat RCTCoreGraphicsFloatFromYogaFloat(float value);
 @property (nonatomic, readonly) UIEdgeInsets borderAsInsets;
 @property (nonatomic, readonly) UIEdgeInsets compoundInsets;
 @property (nonatomic, readonly) CGSize availableSize;
+@property (nonatomic, readonly) CGRect contentFrame;
 
 #pragma mark - Measuring
 

React/Views/RCTShadowView+Layout.m

@@ -81,6 +81,12 @@ CGFloat RCTCoreGraphicsFloatFromYogaFloat(float value)
   return UIEdgeInsetsInsetRect((CGRect){CGPointZero, self.frame.size}, self.compoundInsets).size;
 }
 
+- (CGRect)contentFrame
+{
+  CGRect bounds = (CGRect){CGPointZero, self.frame.size};
+  return UIEdgeInsetsInsetRect(bounds, self.compoundInsets);
+}
+
 #pragma mark - Measuring
 
 - (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize maximumSize:(CGSize)maximumSize