Prepare for writing token streams directly into a snapshot and reading it directly from the snapsho…

vm/snapshot.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SNAPSHOT_H_
 #define VM_SNAPSHOT_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
@@ skipping 304 matching lines @@
 
   // Write serialization header information for an object.
   void WriteSerializationMarker(SerializedHeaderType type, intptr_t id) {
     ASSERT(id <= kMaxObjectId);
     intptr_t value = 0;
     value = SerializedHeaderTag::update(type, value);
     value = SerializedHeaderData::update(id, value);
     WriteIntptrValue(value);
   }
 
+  // Write out a buffer of bytes.
+  void WriteBytes(const uint8_t* addr, intptr_t len) {
+    stream_.WriteBytes(addr, len);
+  }
+
   // Finalize the serialized buffer by filling in the header information
   // which comprises of a flag(snaphot kind) and the length of
   // serialzed bytes.
   void FinalizeBuffer(Snapshot::Kind kind) {
     int32_t* data = reinterpret_cast<int32_t*>(stream_.buffer());
     data[Snapshot::kLengthIndex] = stream_.bytes_written();
     data[Snapshot::kSnapshotFlagIndex] = kind;
   }
 
  protected:
@@ skipping 135 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_