Add option to gen_snapshot for creating a Makefile describing a snapshot's dependencies.

runtime/bin/isolate_data.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 RUNTIME_BIN_ISOLATE_DATA_H_
 #define RUNTIME_BIN_ISOLATE_DATA_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
 
 namespace dart {
+
+// Forward declaration.
+template <typename T>
+class MallocGrowableArray;
+
+}  // namespace dart
+
+namespace dart {
 namespace bin {
 
 // Forward declaration.
 class AppSnapshot;
 class EventHandler;
 class Loader;
 
 // Data associated with every isolate in the standalone VM
 // embedding. This is used to free external resources for each isolate
 // when the isolate shuts down.
@@ skipping 25 matching lines @@
   // While loading a loader is associated with the isolate.
   bool HasLoader() const { return loader_ != NULL; }
   Loader* loader() const {
     ASSERT(loader_ != NULL);
     return loader_;
   }
   void set_loader(Loader* loader) {
     ASSERT((loader_ == NULL) || (loader == NULL));
     loader_ = loader;
   }
+  MallocGrowableArray<char*>* dependencies() const { return dependencies_; }
+  void set_dependencies(MallocGrowableArray<char*>* deps) {
+    dependencies_ = deps;
+  }
 
  private:
   Dart_Handle builtin_lib_;
   Loader* loader_;
   AppSnapshot* app_snapshot_;
+  MallocGrowableArray<char*>* dependencies_;
 
   DISALLOW_COPY_AND_ASSIGN(IsolateData);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_ISOLATE_DATA_H_