Add optional message to assert in Dart2js.

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

Index: pkg/compiler/lib/src/resolution/registry.dart
diff --git a/pkg/compiler/lib/src/resolution/registry.dart b/pkg/compiler/lib/src/resolution/registry.dart
index 552914c572a93df97820ff63795ee7ed86f8e5a9..98784ff26a93ba8a8ebbedd2a0e3ffd7d66ac23e 100644
--- a/pkg/compiler/lib/src/resolution/registry.dart
+++ b/pkg/compiler/lib/src/resolution/registry.dart
@@ -56,6 +56,11 @@ class EagerRegistry implements Registry {
   Iterable<Element> get otherDependencies => mapping.otherDependencies;
 
   @override
+  void registerAssert() {
+    //mapping.registerAssert();//TODO: SOmething here?

[Johnni Winther, 2015/09/01 13:32:05]

Add a TODO for me to resolve this.

[Lasse Reichstein Nielsen, 2015/09/03 11:23:25]

Done.

+  }
+
+  @override
   void registerDependency(Element element) {
     mapping.registerDependency(element);
   }
@@ -580,13 +585,8 @@ class ResolutionRegistry implements Registry {
     world.registerInstantiatedType(type, this);
   }
 
-  void registerAssert(Send node) {
-    mapping.setAssert(node);
-    backend.resolutionCallbacks.onAssert(node, this);
-  }
-
-  bool isAssert(Send node) {
-    return mapping.isAssert(node);
+  void registerAssert() {
+    backend.resolutionCallbacks.onAssert(this);
   }
 
   void registerSendStructure(Send node, SendStructure sendStructure) {