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

runtime/vm/timeline_analysis.cc

 // Copyright (c) 2015, 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/timeline_analysis.h"
 
 #include "vm/flags.h"
+#include "vm/isolate.h"
 #include "vm/log.h"
 #include "vm/os_thread.h"
 
 namespace dart {
 
 #ifndef PRODUCT
 
 DECLARE_FLAG(bool, trace_timeline_analysis);
 DECLARE_FLAG(bool, timing);
 
@@ skipping 595 matching lines @@
             MicrosecondsToMilliseconds(pause_info->exclusive_micros()));
   THR_Print("%.3f ms max on stack; ",
             MicrosecondsToMilliseconds(pause_info->max_inclusive_micros()));
   THR_Print("%.3f ms max executing.\n",
             MicrosecondsToMilliseconds(pause_info->max_exclusive_micros()));
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart