Infer types for parameters even in the presence of InvocationMirror.delegate.

sdk/lib/_internal/compiler/implementation/universe/universe.dart

Index: sdk/lib/_internal/compiler/implementation/universe/universe.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/universe/universe.dart	(revision 29416)
+++ sdk/lib/_internal/compiler/implementation/universe/universe.dart	(working copy)
@@ -595,6 +595,10 @@
     return 'Selector($kind, $name, '
            'arity=$argumentCount$named$type)';
   }
+
+  Selector extendIfReachesAll(Compiler compiler) {
+    return new TypedSelector(compiler.typesTask.dynamicType, this);
+  }
 }
 
 class TypedSelector extends Selector {
@@ -656,4 +660,12 @@
     if (!mask.canHit(element, this, compiler)) return false;
     return appliesUntyped(element, compiler);
   }
+
+  Selector extendIfReachesAll(Compiler compiler) {
+    bool canReachAll = compiler.enabledInvokeOn
+        && mask.needsNoSuchMethodHandling(this, compiler);
+    return canReachAll
+        ? new TypedSelector(compiler.typesTask.dynamicType, this)
+        : this;
+  }
 }