Encode reservation meta data in the snapshot blob.

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"
 
 namespace v8 {
 namespace internal {
 
 
 /**
  * Source to read snapshot and builtins files from.
  *
  * Note: Memory ownership remains with callee.
  */
 class SnapshotByteSource FINAL {
  public:
-  SnapshotByteSource(const byte* array, int length);
-  ~SnapshotByteSource();
+  SnapshotByteSource(const byte* data, int length)
+      : data_(data), length_(length), position_(0) {}
+
+  explicit SnapshotByteSource(Vector<const byte> payload)
+      : data_(payload.start()), length_(payload.length()), position_(0) {}
+
+  ~SnapshotByteSource() {}
 
   bool HasMore() { return position_ < length_; }
 
   byte Get() {
     DCHECK(position_ < length_);
     return data_[position_++];
   }
 
   int32_t GetUnalignedInt();
 
@@ skipping 42 matching lines @@
   ~SnapshotByteSink() {}
 
   void Put(byte b, const char* description) { data_.Add(b); }
 
   void PutSection(int b, const char* description) {
     DCHECK_LE(b, kMaxUInt8);
     Put(static_cast<byte>(b), 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);
+  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_; }
 
  private:
   List<byte> data_;
 };
 
 }  // namespace v8::internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SOURCE_SINK_H_