Add the concept of a V8 extras exports object

src/runtime/runtime-test.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen.h"
 #include "src/runtime/runtime-utils.h"
@@ skipping 346 matching lines @@
   return NULL;
 }
 
 
 RUNTIME_FUNCTION(Runtime_NativeScriptsCount) {
   DCHECK(args.length() == 0);
   return Smi::FromInt(Natives::GetBuiltinsCount());
 }
 
 
+RUNTIME_FUNCTION(Runtime_NativeExtrasCount) {
+  DCHECK(args.length() == 0);
+  return Smi::FromInt(ExtraNatives::GetBuiltinsCount());
+}
+
+
 // Returns V8 version as a string.
 RUNTIME_FUNCTION(Runtime_GetV8Version) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
 
   const char* version_string = v8::V8::GetVersion();
 
   return *isolate->factory()->NewStringFromAsciiChecked(version_string);
 }
 
@@ skipping 106 matching lines @@
   RUNTIME_FUNCTION(Runtime_HasFixed##Type##Elements) {                        \
     CONVERT_ARG_CHECKED(JSObject, obj, 0);                                    \
     return isolate->heap()->ToBoolean(obj->HasFixed##Type##Elements());       \
   }
 
 TYPED_ARRAYS(FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION)
 
 #undef FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
 }
 }  // namespace v8::internal