Add ArrayBufferView definition to ES6 lib

src/lib/es6.d.ts

@@ -1332,4 +1332,10 @@ interface PromiseConstructor {
     resolve(): Promise<void>;
 }
 
-declare var Promise: PromiseConstructor;
+declare var Promise: PromiseConstructor;
+
+interface ArrayBufferView {
+    buffer: ArrayBuffer;
+    byteOffset: number;
+    byteLength: number;
+}