Add accessors for Maps to the embedding API.

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index 2f844f349322d27ba5d6bbfc82073c178a5494f4..3b6b228eb972c4ce9699f7ebd0eda8ee59ab6d41 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -1325,6 +1325,7 @@ DART_EXPORT bool Dart_IsString(Dart_Handle object);
 DART_EXPORT bool Dart_IsStringLatin1(Dart_Handle object);  /* (ISO-8859-1) */
 DART_EXPORT bool Dart_IsExternalString(Dart_Handle object);
 DART_EXPORT bool Dart_IsList(Dart_Handle object);
+DART_EXPORT bool Dart_IsMap(Dart_Handle object);
 DART_EXPORT bool Dart_IsLibrary(Dart_Handle object);
 DART_EXPORT bool Dart_IsType(Dart_Handle handle);
 DART_EXPORT bool Dart_IsFunction(Dart_Handle handle);
@@ -1776,7 +1777,7 @@ DART_EXPORT Dart_Handle Dart_ListLength(Dart_Handle list, intptr_t* length);
  * \param list A List.
  * \param index A valid index into the List.
  *
- * \return The Object in the List at the specified index if no errors
+ * \return The Object in the List at the specified index if no error
  *   occurs. Otherwise returns an error handle.
  */
 DART_EXPORT Dart_Handle Dart_ListGetAt(Dart_Handle list,
@@ -1817,6 +1818,50 @@ DART_EXPORT Dart_Handle Dart_ListSetAsBytes(Dart_Handle list,
 
 
 /*
+ * ====
+ * Maps
+ * ====
+ */
+
+/**
+ * Gets the Object at some key of a Map.
+ *
+ * May generate an unhandled exception error.
+ *
+ * \param map A Map.
+ * \param key An Object.
+ *
+ * \return The value in the map at the specified key, null if the map does not
+ *   contain the key, or an error handle.
+ */
+DART_EXPORT Dart_Handle Dart_MapGetAt(Dart_Handle map, Dart_Handle key);
+
+/**
+ * Returns whether the Map contains a given key.
+ *
+ * May generate an unhandled exception error.
+ *
+ * \param map A Map.
+ *
+ * \return A handle on a boolean indicating whether map contains the key.
+ *   Otherwise returns an error handle.
+ */
+DART_EXPORT Dart_Handle Dart_MapContainsKey(Dart_Handle map, Dart_Handle key);
+
+/**
+ * Gets the list of keys of a Map.
+ *
+ * May generate an unhandled exception error.
+ *
+ * \param map A Map.
+ *
+ * \return The list of key Objects if no error occurs. Otherwise returns an
+ *   error handle.
+ */
+DART_EXPORT Dart_Handle Dart_MapKeys(Dart_Handle map);
+
+
+/*
  * ==========
  * Typed Data
  * ==========