Encode reservation meta data in the snapshot blob.

src/snapshot-source-sink.h

Index: src/snapshot-source-sink.h
diff --git a/src/snapshot-source-sink.h b/src/snapshot-source-sink.h
index 68901a13190135a9cd457e968ec88f96285058e8..216efef56f6896f741f80001da7dc4d62ea1970b 100644
--- a/src/snapshot-source-sink.h
+++ b/src/snapshot-source-sink.h
@@ -19,7 +19,7 @@ namespace internal {
  */
 class SnapshotByteSource FINAL {
  public:
-  SnapshotByteSource(const byte* array, int length);
+  explicit SnapshotByteSource(Vector<const byte> payload);
   ~SnapshotByteSource();
 
   bool HasMore() { return position_ < length_; }
@@ -83,8 +83,8 @@ class SnapshotByteSink {
   }
 
   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);
+  void PutRaw(const byte* data, int number_of_bytes, const char* description);
+  void PutBlob(Vector<const byte> blob, const char* description);
   int Position() { return data_.length(); }
 
   const List<byte>& data() const { return data_; }