Patches to support Dart VM patch files in dart2js.

pkg/compiler/lib/src/common/tasks.dart

 // 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.
 
 library dart2js.common.tasks;
 
 import 'dart:async' show
     Future,
     Zone,
     ZoneDelegate,
@@ skipping 186 matching lines @@
     assert(watch != null);
     return reporter.withCurrentElement(element, () => measure(action));
   }
 
   /// Measure the time spent in [action] (if in verbose mode) and accumulate it
   /// under a subtask with the given name.
   measureSubtask(String name, action()) {
     return watch == null ? action() : measureSubtaskHelper(name, action);
   }
 
+  /// Measure the time spent in [action] (if in verbose mode) and accumulate it
+  /// under a subtask with the given name.
+  measureSubtaskElement(String name, Element element, action()) {
+    return watch == null
+        ? reporter.withCurrentElement(element, action)
+        : measureSubtaskElementHelper(name, element, action);
+  }
+
+  /// Helper method for [measureSubtaskElement]. Don't call this directly as it
+  /// assumes that [watch] isn't null.
+  measureSubtaskElementHelper(String name, Element element, action()) {
+    assert(watch != null);
+    return reporter.withCurrentElement(
+        element, () => measureSubtaskHelper(name, action));
+  }
+
   /// Helper method for [measureSubtask]. Don't call this directly as it
   /// assumes that [watch] isn't null.
   measureSubtaskHelper(String name, action()) {
     assert(watch != null);
     // Use a nested CompilerTask for the measurement to ensure nested [measure]
     // calls work correctly. The subtasks will never themselves have nested
     // subtasks because they are not accessible outside.
     GenericTask subtask =
         _subtasks.putIfAbsent(name, () => new GenericTask(name, compiler));
     return subtask.measure(action);
@@ skipping 49 matching lines @@
   }
 
   /// Call this when the eventloop returns control to us.
   void stopAsyncWallClock() {
     if (currentAsyncTask != null) {
       currentAsyncTask.watch.stop();
     }
     asyncWallClock.stop();
   }
 }