First cut at API for native Typed Arrays.

src/objects.h

 // Copyright 2012 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 8629 matching lines @@
 
   // [byte_length]: length of typed array in bytes.
   DECL_ACCESSORS(byte_length, Object)
 
   // [length]: length of typed array in elements.
   DECL_ACCESSORS(length, Object)
 
   // Casting.
   static inline JSTypedArray* cast(Object* obj);
 
+  ExternalArrayType type();
+
   // Dispatched behavior.
   DECLARE_PRINTER(JSTypedArray)
   DECLARE_VERIFIER(JSTypedArray)
 
   static const int kBufferOffset = JSObject::kHeaderSize;
   static const int kByteOffsetOffset = kBufferOffset + kPointerSize;
   static const int kByteLengthOffset = kByteOffsetOffset + kPointerSize;
   static const int kLengthOffset = kByteLengthOffset + kPointerSize;
   static const int kSize = kLengthOffset + kPointerSize;
 
@@ skipping 803 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_