Use ParametrizedType instead of Type where appropriate. Expand ToCString of type related classes.

runtime/vm/snapshot.cc

 // Copyright (c) 2011, 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.
 
 #include "vm/snapshot.h"
 
 #include "vm/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/heap.h"
 #include "vm/object.h"
@@ skipping 268 matching lines @@
   }
 
   // Check if it is a singleton boolean false value.
   if (rawobj == object_store()->false_value()) {
     WriteObjectHeader(kObjectId, ObjectStore::kFalseValue);
     return;
   }
 
   // Check if classes are not being serialized and it is preinitialized type.
   if (!serialize_classes_) {
-    RawType* raw_type = reinterpret_cast<RawType*>(rawobj);
+    RawParameterizedType* raw_type =
+        reinterpret_cast<RawParameterizedType*>(rawobj);
     index = object_store()->GetTypeIndex(raw_type);
     if (index != ObjectStore::kInvalidIndex) {
       WriteObjectHeader(kObjectId, index);
       return;
     }
   }
 
   // Now write the object out inline in the stream.
   WriteInlinedObject(rawobj);
 }
@@ skipping 127 matching lines @@
 
 
 void SnapshotWriterVisitor::VisitPointers(RawObject** first, RawObject** last) {
   for (RawObject** current = first; current <= last; current++) {
     RawObject* raw_obj = *current;
     writer_->WriteObject(raw_obj);
   }
 }
 
 }  // namespace dart