First cut at impementing ES6 TypedArrays in V8.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 5cde67d7e97e17560c8e22553a0909eb20f38532..0fa602e017bd9bfa3c1c6d08df3aee21946a2ff2 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -675,6 +675,7 @@ bool Object::IsBoolean() {
 
 TYPE_CHECKER(JSArray, JS_ARRAY_TYPE)
 TYPE_CHECKER(JSArrayBuffer, JS_ARRAY_BUFFER_TYPE)
+TYPE_CHECKER(JSTypedArray, JS_TYPED_ARRAY_TYPE)
 TYPE_CHECKER(JSRegExp, JS_REGEXP_TYPE)
 
 
@@ -1602,6 +1603,8 @@ int JSObject::GetHeaderSize() {
       return JSArray::kSize;
     case JS_ARRAY_BUFFER_TYPE:
       return JSArrayBuffer::kSize;
+    case JS_TYPED_ARRAY_TYPE:
+      return JSTypedArray::kSize;
     case JS_SET_TYPE:
       return JSSet::kSize;
     case JS_MAP_TYPE:
@@ -2489,6 +2492,7 @@ CAST_ACCESSOR(JSBuiltinsObject)
 CAST_ACCESSOR(Code)
 CAST_ACCESSOR(JSArray)
 CAST_ACCESSOR(JSArrayBuffer)
+CAST_ACCESSOR(JSTypedArray)
 CAST_ACCESSOR(JSRegExp)
 CAST_ACCESSOR(JSProxy)
 CAST_ACCESSOR(JSFunctionProxy)
@@ -5191,6 +5195,12 @@ void JSArrayBuffer::set_backing_store(void* value, WriteBarrierMode mode) {
 ACCESSORS(JSArrayBuffer, byte_length, Object, kByteLengthOffset)
 
 
+ACCESSORS(JSTypedArray, buffer, Object, kBufferOffset)
+ACCESSORS(JSTypedArray, byte_offset, Object, kByteOffsetOffset)
+ACCESSORS(JSTypedArray, byte_length, Object, kByteLengthOffset)
+ACCESSORS(JSTypedArray, length, Object, kLengthOffset)
+
+
 ACCESSORS(JSRegExp, data, Object, kDataOffset)