Implement heap snapshots serialization into JSON. API is designed

src/unicode.h

Index: src/unicode.h
diff --git a/src/unicode.h b/src/unicode.h
index a3b799ebdacf734c23a6ee5320119b39f58a363d..9d1d683231e7ad233e70f5c58a34d10133cc4534 100644
--- a/src/unicode.h
+++ b/src/unicode.h
@@ -120,6 +120,9 @@ class Utf8 {
   static inline unsigned Encode(char* out, uchar c);
   static const byte* ReadBlock(Buffer<const char*> str, byte* buffer,
       unsigned capacity, unsigned* chars_read, unsigned* offset);
+  static uchar CalculateValue(const byte* str,
+                              unsigned length,
+                              unsigned* cursor);
   static const uchar kBadChar = 0xFFFD;
   static const unsigned kMaxEncodedSize   = 4;
   static const unsigned kMaxOneByteChar   = 0x7f;
@@ -133,9 +136,6 @@ class Utf8 {
   static inline uchar ValueOf(const byte* str,
                               unsigned length,
                               unsigned* cursor);
-  static uchar CalculateValue(const byte* str,
-                              unsigned length,
-                              unsigned* cursor);
 };
 
 // --- C h a r a c t e r   S t r e a m ---