Clean up naming scheme for reflection names.

sdk/lib/_internal/compiler/js_lib/js_mirrors.dart

Index: sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart b/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
index 9fc50b79836fd5d187c75d30a091f6f814f8cc1e..c69e159d9803716540224ef8862e6814bfdb8b75 100644
--- a/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
+++ b/sdk/lib/_internal/compiler/js_lib/js_mirrors.dart
@@ -991,7 +991,7 @@ class JsInstanceMirror extends JsObjectMirror implements InstanceMirror {
       case JSInvocationMirror.METHOD:
         if (namedArguments.isNotEmpty) return '$name*';
         int nbArgs = positionalArguments.length as int;
-        return "$name:$nbArgs:0";
+        return "$name:$nbArgs";
     }
     throw new RuntimeError("Could not compute reflective name for $name");
   }
@@ -1685,7 +1685,7 @@ class JsClassMirror extends JsTypeMirror with JsObjectMirror
       // reflection with metadata.
       if (simpleName == null) continue;
       var function = JS('', '#[#]', prototype, key);
-      if (isNoSuchMethodStub(function)) continue;
+      if (!isOrdinaryReflectableMethod(function)) continue;
       if (isAliasedSuperMethod(function, key)) continue;
       var mirror =
           new JsMethodMirror.fromUnmangledName(
@@ -2331,8 +2331,11 @@ class JsMethodMirror extends JsDeclarationMirror implements MethodMirror {
         requiredParameterCount = 0;
       }
     } else {
-      requiredParameterCount = int.parse(info[1]);
-      optionalParameterCount = int.parse(info[2]);
+      ReflectionInfo reflectionInfo = new ReflectionInfo(jsFunction);
+      requiredParameterCount = reflectionInfo.requiredParameterCount;
+      optionalParameterCount = reflectionInfo.optionalParameterCount;
+      assert(int.parse(info[1]) == requiredParameterCount
+          + optionalParameterCount);
     }
     return new JsMethodMirror(
         s(name), jsFunction, requiredParameterCount, optionalParameterCount,
@@ -2959,8 +2962,10 @@ bool isReflectiveDataInPrototype(String key) {
   return firstChar == '*' || firstChar == '+';
 }
 
-bool isNoSuchMethodStub(var jsFunction) {
-  return JS('bool', r'#.$reflectable == 2', jsFunction);
+/// Returns `true` if [jsFunction] is an ordinary reflectable method and
+/// not a (potentially reflectable) stub or otherwise non-reflectable method.
+bool isOrdinaryReflectableMethod(var jsFunction) {
+  return JS('bool', r'#.$reflectable === 1', jsFunction);
 }
 
 /// Returns true if [key] is only an aliased entry for [function] in the