Introduce code serializer/deserializer.

src/snapshot-source-sink.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_SNAPSHOT_SOURCE_SINK_H_
 #define V8_SNAPSHOT_SOURCE_SINK_H_
 
 #include "src/base/logging.h"
 #include "src/utils.h"
 
@@ skipping 64 matching lines @@
   virtual void PutSection(int byte, const char* description) {
     Put(byte, description);
   }
   void PutInt(uintptr_t integer, const char* description);
   void PutRaw(byte* data, int number_of_bytes, const char* description);
   void PutBlob(byte* data, int number_of_bytes, const char* description);
   virtual int Position() = 0;
 };
 
 
+class DummySnapshotSink : public SnapshotByteSink {
+ public:
+  DummySnapshotSink() : length_(0) {}
+  virtual ~DummySnapshotSink() {}
+  virtual void Put(int byte, const char* description) { length_++; }
+  virtual int Position() { return length_; }
+
+ private:
+  int length_;
+};
+
+
+// Wrap a SnapshotByteSink into a DebugSnapshotSink to get debugging output.
+class DebugSnapshotSink : public SnapshotByteSink {
+ public:
+  explicit DebugSnapshotSink(SnapshotByteSink* chained) : sink_(chained) {}
+  virtual void Put(int byte, const char* description) V8_OVERRIDE;
+  virtual int Position() V8_OVERRIDE { return sink_->Position(); }
+
+ private:
+  SnapshotByteSink* sink_;
+};
+
+
+class ListSnapshotSink : public i::SnapshotByteSink {
+ public:
+  explicit ListSnapshotSink(i::List<char>* data) : data_(data) {}
+  virtual void Put(int byte, const char* description) V8_OVERRIDE {
+    data_->Add(byte);
+  }
+  virtual int Position() V8_OVERRIDE { return data_->length(); }
+
+ private:
+  i::List<char>* data_;
+};
+
 }  // namespace v8::internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SOURCE_SINK_H_