Add an experimental public API for value serialization.

src/counters.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_COUNTERS_H_
 #define V8_COUNTERS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 639 matching lines @@
   V(TypeError_New)                                         \
   V(Uint16Array_New)                                       \
   V(Uint32Array_New)                                       \
   V(Uint8Array_New)                                        \
   V(Uint8ClampedArray_New)                                 \
   V(UnboundScript_GetId)                                   \
   V(UnboundScript_GetLineNumber)                           \
   V(UnboundScript_GetName)                                 \
   V(UnboundScript_GetSourceMappingURL)                     \
   V(UnboundScript_GetSourceURL)                            \
-  V(Value_TypeOf)
+  V(Value_TypeOf)                                          \
+  V(ValueDeserializer_ReadValue)                           \
+  V(ValueSerializer_WriteValue)
 
 #define FOR_EACH_MANUAL_COUNTER(V)                  \
   V(AccessorGetterCallback)                         \
   V(AccessorNameGetterCallback)                     \
   V(AccessorNameSetterCallback)                     \
   V(Compile)                                        \
   V(CompileCode)                                    \
   V(CompileCodeLazy)                                \
   V(CompileDeserialize)                             \
   V(CompileEval)                                    \
@@ skipping 564 matching lines @@
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COUNTERS_H_