Patches to support Dart VM patch files in dart2js.

pkg/compiler/lib/src/js_backend/backend.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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 559 matching lines @@
       return element;
     }
     if (isJsInterop(element)) {
       if (element.memberName == const PublicName('[]') ||
           element.memberName == const PublicName('[]=')) {
         reporter.reportErrorMessage(
             element, MessageKind.JS_INTEROP_INDEX_NOT_SUPPORTED);
       }
       return element;
     }
-    return patchResolverTask.measure(() {
-      return patchResolverTask.resolveExternalFunction(element);
-    });
+    return patchResolverTask.resolveExternalFunction(element);
   }
 
   bool isForeign(Element element) => element.library == helpers.foreignLibrary;
 
   bool isBackendLibrary(LibraryElement library) {
     return library == helpers.interceptorsLibrary ||
         library == helpers.jsHelperLibrary;
   }
 
   static Namer determineNamer(Compiler compiler) {
@@ skipping 2389 matching lines @@
 
   @override
   void onImpactUsed(ImpactUseCase impactUse) {
     if (impactUse == DeferredLoadTask.IMPACT_USE && !supportSerialization) {
       // TODO(johnniwinther): Allow emptying when serialization has been
       // performed.
       resolution.emptyCache();
     }
   }
 }