Omits size bits when writing RawObject tags to a snapshot.

runtime/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 178 matching lines @@
   void ReadBytes(uint8_t* addr, intptr_t len) {
     stream_.ReadBytes(addr, len);
   }
 
   double ReadDouble() {
     double result;
     stream_.ReadBytes(reinterpret_cast<uint8_t*>(&result), sizeof(result));
     return result;
   }
 
+  intptr_t ReadTags() {
+    const intptr_t tags = static_cast<intptr_t>(Read<int8_t>()) & 0xff;
+    ASSERT(SerializedHeaderTag::decode(tags) != kObjectId);
+    return tags;
+  }
 
   const uint8_t* CurrentBufferAddress() const {
     return stream_.AddressOfCurrentPosition();
   }
 
   void Advance(intptr_t value) {
     stream_.Advance(value);
   }
 
   RawSmi* ReadAsSmi();
@@ skipping 224 matching lines @@
 
   // Write serialization header information for an object.
   void WriteInlinedObjectHeader(intptr_t id) {
     ASSERT(id <= kMaxObjectId);
     intptr_t value = 0;
     value = SerializedHeaderTag::update(kInlined, value);
     value = SerializedHeaderData::update(id, value);
     WriteIntptrValue(value);
   }
 
+  void WriteTags(intptr_t tags) {
+    ASSERT(SerializedHeaderTag::decode(tags) != kObjectId);
+    const intptr_t flags = tags & 0xff;
+    Write<int8_t>(static_cast<int8_t>(flags));
+  }
+
   // Write out a buffer of bytes.
   void WriteBytes(const uint8_t* addr, intptr_t len) {
     stream_.WriteBytes(addr, len);
   }
 
   void WriteDouble(double value) {
     stream_.WriteBytes(reinterpret_cast<const uint8_t*>(&value), sizeof(value));
   }
 
  protected:
@@ skipping 196 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_