Implement ArrayBuffer.isView.

test/mjsunit/harmony/typedarrays.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 105 matching lines @@
 TestArrayBufferSlice();
 
 // Typed arrays
 
 function TestTypedArray(constr, elementSize, typicalElement) {
   assertSame(elementSize, constr.BYTES_PER_ELEMENT);
 
   var ab = new ArrayBuffer(256*elementSize);
 
   var a0 = new constr(30);
+  assertTrue(ArrayBuffer.isView(a0));
   assertSame(elementSize, a0.BYTES_PER_ELEMENT);
   assertSame(30, a0.length);
   assertSame(30*elementSize, a0.byteLength);
   assertSame(0, a0.byteOffset);
   assertSame(30*elementSize, a0.buffer.byteLength);
 
   var aLen0 = new constr(0);
   assertSame(elementSize, aLen0.BYTES_PER_ELEMENT);
   assertSame(0, aLen0.length);
   assertSame(0, aLen0.byteLength);
@@ skipping 333 matching lines @@
   assertThrows(function() { a.set(0, 1); }, TypeError);
 }
 
 TestTypedArraySet();
 
 // DataView
 function TestDataViewConstructor() {
   var ab = new ArrayBuffer(256);
 
   var d1 = new DataView(ab, 1, 255);
+  assertTrue(ArrayBuffer.isView(d1));
   assertSame(ab, d1.buffer);
   assertSame(1, d1.byteOffset);
   assertSame(255, d1.byteLength);
 
   var d2 = new DataView(ab, 2);
   assertSame(ab, d2.buffer);
   assertSame(2, d2.byteOffset);
   assertSame(254, d2.byteLength);
 
   var d3 = new DataView(ab);
@@ skipping 84 matching lines @@
 TestArbitrary(new ArrayBuffer(256));
 for(i = 0; i < typedArrayConstructors.lenght; i++) {
   TestArbitary(new typedArrayConstructors[i](10));
 }
 TestArbitrary(new DataView(new ArrayBuffer(256)));
 
 
 // Test direct constructor call
 assertThrows(function() { ArrayBuffer(); }, TypeError);
 assertThrows(function() { DataView(new ArrayBuffer()); }, TypeError);