Patches to support Dart VM patch files in dart2js.

pkg/compiler/lib/src/resolution/constructors.dart

Index: pkg/compiler/lib/src/resolution/constructors.dart
diff --git a/pkg/compiler/lib/src/resolution/constructors.dart b/pkg/compiler/lib/src/resolution/constructors.dart
index 9e40cff7f7f6d08a0fcb6d131acbf30fb6fd87ae..a89e99abf1ce4113f0f4edbb1633f05791b6a94f 100644
--- a/pkg/compiler/lib/src/resolution/constructors.dart
+++ b/pkg/compiler/lib/src/resolution/constructors.dart
@@ -166,6 +166,10 @@ class InitializerResolver {
     InterfaceType targetType =
         getSuperOrThisLookupTarget(node, isSuperCall: isSuperCall);
     ClassElement lookupTarget = targetType.element;
+    if (constructor.library == lookupTarget.library) {
+      // This allows a class in a patch library to find injected constructors.
+      lookupTarget = lookupTarget.implementation;
+    }
     String constructorName =
         visitor.getRedirectingThisOrSuperConstructorName(node).text;
     ConstructorElement foundConstructor =