Support runtime check of function types.

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

Index: sdk/lib/_internal/compiler/implementation/universe/universe.dart
diff --git a/sdk/lib/_internal/compiler/implementation/universe/universe.dart b/sdk/lib/_internal/compiler/implementation/universe/universe.dart
index ae3b54b4f93250132e282f297243a795d101f9b0..bb558012d3d1320a5610cc92044c61a2e0a2b947 100644
--- a/sdk/lib/_internal/compiler/implementation/universe/universe.dart
+++ b/sdk/lib/_internal/compiler/implementation/universe/universe.dart
@@ -50,6 +50,20 @@ class Universe {
   final Set<Element> fieldSetters;
   final Set<DartType> isChecks;
 
+  /**
+   * Set of [:call:] methods in instantiated classes that use type variables
+   * in their signature.
+   */
+  final Set<Element> genericCallMethods;
+
+  /**
+   * Set of methods in instantiated classes that use type variables in their
+   * signature and have potentially been closurized.
+   */
+  final Set<Element> closurizedGenericMembers;
+
+  final Set<Element> closurizedMembers;
+
   bool usingFactoryWithTypeArguments = false;
 
   Universe() : instantiatedClasses = new Set<ClassElement>(),
@@ -60,7 +74,10 @@ class Universe {
                invokedSetters = new Map<SourceString, Set<Selector>>(),
                fieldGetters = new Set<Element>(),
                fieldSetters = new Set<Element>(),
-               isChecks = new Set<DartType>();
+               isChecks = new Set<DartType>(),
+               genericCallMethods = new Set<Element>(),
+               closurizedGenericMembers = new Set<Element>(),
+               closurizedMembers = new Set<Element>();
 
   bool hasMatchingSelector(Set<Selector> selectors,
                            Element member,
@@ -91,6 +108,15 @@ class Universe {
   bool hasFieldSetter(Element member, Compiler compiler) {
     return fieldSetters.contains(member);
   }
+
+  DartType registerIsCheck(DartType type, Compiler compiler) {
+    type = type.unalias(compiler);
+    // Even in checked mode, type annotations for return type and argument
+    // types do not imply type checks, so there should never be a check
+    // against the type variable of a typedef.
+    isChecks.add(type);
+    return type;
+  }
 }
 
 class SelectorKind {