Implement ArrayBuffer.isView.

src/arraybuffer.js

Index: src/arraybuffer.js
diff --git a/src/arraybuffer.js b/src/arraybuffer.js
index 4a4f570146568464dfe8938502e9a827be60c6cd..c5c98dbe4bbeaa04fd2797af69442d4d28096910 100644
--- a/src/arraybuffer.js
+++ b/src/arraybuffer.js
@@ -81,6 +81,10 @@ function ArrayBufferSlice(start, end) {
   return result;
 }
 
+function ArrayBufferIsView(obj) {
+  return %ArrayBufferIsView(obj);
+}
+
 function SetUpArrayBuffer() {
   %CheckIsBootstrapping();
 
@@ -93,6 +97,10 @@ function SetUpArrayBuffer() {
 
   InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength);
 
+  InstallFunctions($ArrayBuffer, DONT_ENUM, $Array(
+      "isView", ArrayBufferIsView
+  ));
+
   InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array(
       "slice", ArrayBufferSlice
   ));