Add the concept of a V8 extras exports object

src/runtime/runtime.h

 // Copyright 2012 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 574 matching lines @@
   F(NotifyContextDisposed, 0, 1)              \
   F(SetAllocationTimeout, -1 /* 2 || 3 */, 1) \
   F(DebugPrint, 1, 1)                         \
   F(DebugTrace, 0, 1)                         \
   F(GlobalPrint, 1, 1)                        \
   F(SystemBreak, 0, 1)                        \
   F(SetFlags, 1, 1)                           \
   F(Abort, 1, 1)                              \
   F(AbortJS, 1, 1)                            \
   F(NativeScriptsCount, 0, 1)                 \
+  F(NativeExtrasCount, 0, 1)                  \
   F(GetV8Version, 0, 1)                       \
   F(DisassembleFunction, 1, 1)                \
   F(TraceEnter, 0, 1)                         \
   F(TraceExit, 1, 1)                          \
   F(HaveSameMap, 2, 1)                        \
   F(HasFastSmiElements, 1, 1)                 \
   F(HasFastObjectElements, 1, 1)              \
   F(HasFastSmiOrObjectElements, 1, 1)         \
   F(HasFastDoubleElements, 1, 1)              \
   F(HasFastHoleyElements, 1, 1)               \
@@ skipping 259 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_