Add {Map,Set}::AsArray to the API

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 16975d5af6b8144633c71d88857798eac3d30ca1..fb07e9ce8c68cdf94d29665cafa614b265b31b8f 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2952,6 +2952,12 @@ class V8_EXPORT Map : public Object {
   size_t Size() const;
 
   /**
+   * Returns an array of [key, value] arrays representing the contents
+   * of this Map.
+   */
+  Local<Array> AsArray() const;
+
+  /**
    * Creates a new Map.
    */
   static Local<Map> New(Isolate* isolate);
@@ -2972,6 +2978,11 @@ class V8_EXPORT Set : public Object {
   size_t Size() const;
 
   /**
+   * Returns an array of the keys in this Set.
+   */
+  Local<Array> AsArray() const;
+
+  /**
    * Creates a new Set.
    */
   static Local<Set> New(Isolate* isolate);