Patches to support Dart VM patch files in dart2js.

pkg/compiler/lib/src/js_backend/patch_resolver.dart

Index: pkg/compiler/lib/src/js_backend/patch_resolver.dart
diff --git a/pkg/compiler/lib/src/js_backend/patch_resolver.dart b/pkg/compiler/lib/src/js_backend/patch_resolver.dart
index 521dd2dccba435e26b86b232c691e8445a3c5f26..596680730681d838b41d7af9dc024216a4e51512 100644
--- a/pkg/compiler/lib/src/js_backend/patch_resolver.dart
+++ b/pkg/compiler/lib/src/js_backend/patch_resolver.dart
@@ -20,7 +20,8 @@ class PatchResolverTask extends CompilerTask {
 
   String get name => 'JavaScript patch resolver';
 
-  FunctionElement resolveExternalFunction(FunctionElementX element) {
+  FunctionElement resolveExternalFunction(FunctionElementX element)
+      => measureElement(element, () {
     if (element.isPatched) {
       FunctionElementX patch = element.patch;
       reporter.withCurrentElement(patch, () {
@@ -33,7 +34,7 @@ class PatchResolverTask extends CompilerTask {
           element, MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION);
     }
     return element;
-  }
+  });
 
   void checkMatchingPatchParameters(FunctionElement origin,
       List<Element> originParameters, List<Element> patchParameters) {