BREAKING - Make first parameter of measure and print functions CSSNodeRef instead of just context

Summary: To perform some JNI optimizations for java we need a reference to the node in the measure function. This updates the API to provide the whole node as input instead of just the context.

Reviewed By: javache

Differential Revision: D4081544

fbshipit-source-id: d49679025cea027cf7b8482898de0a01fe0f9d40

csharp/Facebook.CSSLayout/CSSMeasureFunc.cs

@@ -14,7 +14,7 @@ namespace Facebook.CSSLayout
 {
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
     public delegate CSSSize CSSMeasureFunc(
-        IntPtr context, 
+        IntPtr node, 
         float width,
         CSSMeasureMode widthMode,
         float height,

csharp/Facebook.CSSLayout/CSSNode.cs

@@ -532,7 +532,7 @@ namespace Facebook.CSSLayout
         }
 
         private CSSSize MeasureInternal(
-            IntPtr context,
+            IntPtr node,
             float width,
             CSSMeasureMode widthMode,
             float height,