Add support for context-aware measure and baseline functions

Summary:
@public

Context-aware measure and baseline functions are an internal Yoga feature that will be used for Yoga’s JNI code.

It will be possible to specify a context when calculating layout, which will be passed on to baseline and measure functions. This will be a private feature.

Reviewed By: SidharthGuglani

Differential Revision: D14100509

fbshipit-source-id: acf4a030549b2e38d5ce0cd5dbe837864e5ffd81

yoga/Yoga.cpp

@@ -1080,7 +1080,8 @@ static float YGBaseline(const YGNodeRef node) {
         node,
         &YGNode::baseline,
         node->getLayout().measuredDimensions[YGDimensionWidth],
-        node->getLayout().measuredDimensions[YGDimensionHeight]);
+        node->getLayout().measuredDimensions[YGDimensionHeight],
+        (void*) nullptr);
     YGAssertWithNode(
         node,
         !YGFloatIsUndefined(baseline),
@@ -1697,7 +1698,8 @@ static void YGNodeWithMeasureFuncSetMeasuredDimensions(
         innerWidth,
         widthMeasureMode,
         innerHeight,
-        heightMeasureMode);
+        heightMeasureMode,
+        (void*) nullptr);
 
     node->setLayoutMeasuredDimension(
         YGNodeBoundAxis(