Only reload libraries when they may have been modified.

runtime/vm/raw_object.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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
@@ skipping 978 matching lines @@
     kSourceTag,
     kPatchTag,
     kEvaluateTag,
   };
 
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(Script);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->url_); }
   RawString* url_;
+  RawString* resolved_url_;
   RawArray* compile_time_constants_;
   RawTokenStream* tokens_;
   RawString* source_;
   RawObject** to() {return reinterpret_cast<RawObject**>(&ptr()->source_); }
   RawObject** to_snapshot(Snapshot::Kind kind) {
     switch (kind) {
       case Snapshot::kAppNoJIT:
         return reinterpret_cast<RawObject**>(&ptr()->url_);
       case Snapshot::kCore:
       case Snapshot::kAppWithJIT:
@@ skipping 1411 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_