Implement Percentage support for gap styles (#1643)

Summary:
X-link: https://github.com/facebook/react-native/pull/44067

X-link: https://github.com/facebook/litho/pull/980

Pull Request resolved: https://github.com/facebook/yoga/pull/1643

Changelog [Internal]:
- Added percentage value for flex layout gap
- Wired up to pass proper available width and height to implement this feature

Reviewed By: NickGerleman

Differential Revision: D56002340

fbshipit-source-id: c0bc86ac70a1391f115c87da99c2ef411535f68b

java/com/facebook/yoga/YogaNative.java

@@ -108,6 +108,7 @@ public class YogaNative {
   static native void jni_YGNodeStyleSetAspectRatioJNI(long nativePointer, float aspectRatio);
   static native float jni_YGNodeStyleGetGapJNI(long nativePointer, int gutter);
   static native void jni_YGNodeStyleSetGapJNI(long nativePointer, int gutter, float gapLength);
+  static native void jni_YGNodeStyleSetGapPercentJNI(long nativePointer, int gutter, float gapLength);
   static native void jni_YGNodeSetHasMeasureFuncJNI(long nativePointer, boolean hasMeasureFunc);
   static native void jni_YGNodeSetHasBaselineFuncJNI(long nativePointer, boolean hasMeasureFunc);
   static native void jni_YGNodeSetStyleInputsJNI(long nativePointer, float[] styleInputsArray, int size);

java/com/facebook/yoga/YogaNode.java

@@ -192,6 +192,8 @@ public abstract class YogaNode implements YogaProps {
 
   public abstract void setGap(YogaGutter gutter, float gapLength);
 
+  public abstract void setGapPercent(YogaGutter gutter, float gapLength);
+
   public abstract float getLayoutX();
 
   public abstract float getLayoutY();

java/com/facebook/yoga/YogaNodeJNIBase.java

@@ -721,4 +721,9 @@ public abstract class YogaNodeJNIBase extends YogaNode implements Cloneable {
   public void setGap(YogaGutter gutter, float gapLength) {
     YogaNative.jni_YGNodeStyleSetGapJNI(mNativePointer, gutter.intValue(), gapLength);
   }
+
+  @Override
+  public void setGapPercent(YogaGutter gutter, float gapLength) {
+    YogaNative.jni_YGNodeStyleSetGapPercentJNI(mNativePointer, gutter.intValue(), gapLength);
+  }
 }