Redo how Type objects are exposed from DDC.

lib/runtime/dart_sdk.js

Index: lib/runtime/dart_sdk.js
diff --git a/lib/runtime/dart_sdk.js b/lib/runtime/dart_sdk.js
index 2b80cf605c72208f5852d37756d467bc541e9ef9..f730a6dbd76105bfac3cef8e2a771db39d9571eb 100644
--- a/lib/runtime/dart_sdk.js
+++ b/lib/runtime/dart_sdk.js
@@ -500,7 +500,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return false;
   };
   dart.strongInstanceOf = function(obj, type, ignoreFromWhiteList) {
-    let actual = dart.realRuntimeType(obj);
+    let actual = dart.getReifiedType(obj);
     if (dart.isSubtype(actual, type) || actual == dart.jsobject || actual == core.int && type == core.double) return true;
     if (ignoreFromWhiteList == void 0) return false;
     if (dart.isGroundType(type)) return false;
@@ -514,12 +514,12 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.is = function(obj, type) {
     if (dart.strongInstanceOf(obj, type)) return true;
     if (dart.isGroundType(type)) return false;
-    let actual = dart.realRuntimeType(obj);
+    let actual = dart.getReifiedType(obj);
     dart.throwStrongModeError('Strong mode is check failure: ' + dart.typeName(actual) + ' does not soundly subtype ' + dart.typeName(type));
   };
   dart.as = function(obj, type) {
     if (dart.instanceOfOrNull(obj, type)) return obj;
-    let actual = dart.realRuntimeType(obj);
+    let actual = dart.getReifiedType(obj);
     if (dart.isGroundType(type)) dart.throwCastError(actual, type);
     if (dart._ignoreTypeFailure(actual, type)) return obj;
     dart.throwStrongModeError('Strong mode cast failure from ' + dart.typeName(actual) + ' to ' + dart.typeName(type));
@@ -529,7 +529,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return null;
     }
     if (Math.floor(obj) != obj) {
-      dart.throwCastError(dart.realRuntimeType(obj), core.int);
+      dart.throwCastError(dart.getReifiedType(obj), core.int);
     }
     return obj;
   };
@@ -612,7 +612,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   };
   dart.constants = new Map();
   dart.const = function(obj) {
-    let objectKey = [dart.realRuntimeType(obj)];
+    let objectKey = [dart.getReifiedType(obj)];
     for (let name of dart.getOwnNamesAndSymbols(obj)) {
       objectKey.push(name);
       objectKey.push(obj[name]);
@@ -709,16 +709,17 @@ dart_library.library('dart_sdk', null, /* Imports */[
   };
   dart.runtimeType = function(obj) {
     let result = dart.checkPrimitiveType(obj);
-    if (result !== null) return result;
-    result = obj.runtimeType;
-    if (result) return result;
-    return dart._nonPrimitiveRuntimeType(obj);
+    if (result !== null) return dart.wrapType(result);
+    return obj.runtimeType;
   };
   dart.getFunctionType = function(obj) {
     let args = Array(obj.length).fill(dart.dynamic);
     return dart.definiteFunctionType(dart.bottom, args);
   };
-  dart.realRuntimeType = function(obj) {
+  dart.objectRuntimeType = function(obj) {
+    return dart.wrapType(dart.getReifiedType(obj));
+  };
+  dart.getReifiedType = function(obj) {
     let result = dart.checkPrimitiveType(obj);
     if (result !== null) return result;
     return dart._nonPrimitiveRuntimeType(obj);
@@ -734,6 +735,12 @@ dart_library.library('dart_sdk', null, /* Imports */[
     }
     return result;
   };
+  dart.wrapType = function(type) {
+    if (type.hasOwnProperty(dart._typeObject)) {
+      return type[dart._typeObject];
+    }
+    return type[dart._typeObject] = new dart.WrappedType(type);
+  };
   dart.read = function(value) {
     return value[dart._runtimeType];
   };
@@ -756,6 +763,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart._mixins = Symbol("mixins");
   dart.implements = Symbol("implements");
   dart.metadata = Symbol("metadata");
+  dart._typeObject = Symbol("typeObject");
   dart.TypeRep = class TypeRep {
     get name() {
       return this.toString();
@@ -788,6 +796,15 @@ dart_library.library('dart_sdk', null, /* Imports */[
     }
   };
   dart.jsobject = new dart.JSObject();
+  dart.WrappedType = class WrappedType extends dart.TypeRep {
+    constructor(type) {
+      super();
+      this._runtimeType = type;
+    }
+    toString() {
+      return dart.typeName(this._runtimeType);
+    }
+  };
   dart.AbstractFunctionType = class AbstractFunctionType extends dart.TypeRep {
     constructor() {
       super();
@@ -945,15 +962,19 @@ dart_library.library('dart_sdk', null, /* Imports */[
     if (tag === core.Type) {
       let name = type.name;
       let args = dart.getGenericArgs(type);
-      if (args) {
-        name += '<';
-        for (let i = 0; i < args.length; ++i) {
-          if (i > 0) name += ', ';
-          name += dart.typeName(args[i]);
-        }
-        name += '>';
-      }
-      return name;
+      if (!args) return name;
+      let result = name;
+      let allDynamic = true;
+      result += '<';
+      for (let i = 0; i < args.length; ++i) {
+        if (i > 0) name += ', ';
+        let argName = dart.typeName(args[i]);
+        if (argName != 'dynamic') allDynamic = false;
+        result += argName;
+      }
+      result += '>';
+      if (allDynamic) return name;
+      return result;
     }
     if (tag) return "Not a type: " + tag.name;
     return "JSObject<" + type.name + ">";
@@ -1227,7 +1248,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       dart.throw(new core.NoSuchMethodError(this, invocation.memberName, invocation.positionalArguments, invocation.namedArguments));
     }
     get runtimeType() {
-      return dart.realRuntimeType(this);
+      return dart.objectRuntimeType(this);
     }
   };
   dart.setSignature(core.Object, {
@@ -1283,14 +1304,14 @@ dart_library.library('dart_sdk', null, /* Imports */[
   };
   dart.fn(_debugger.isRegularDartObject, () => dart.definiteFunctionType(core.bool, [dart.dynamic]));
   _debugger.getObjectTypeName = function(object) {
-    let realRuntimeType = dart.realRuntimeType(object);
-    if (realRuntimeType == null) {
+    let reifiedType = dart.getReifiedType(object);
+    if (reifiedType == null) {
       if (_debugger._typeof(object) == 'function') {
         return '[[Raw JavaScript Function]]';
       }
       return '<Error getting type name>';
     }
-    return _debugger.getTypeName(dart.as(realRuntimeType, core.Type));
+    return _debugger.getTypeName(dart.as(reifiedType, core.Type));
   };
   dart.fn(_debugger.getObjectTypeName, () => dart.definiteFunctionType(core.String, [dart.dynamic]));
   _debugger.getTypeName = function(type) {
@@ -1530,7 +1551,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return true;
     }
     [_addMembers](current, object, properties) {
-      let className = dart.dload(dart.realRuntimeType(current), 'name');
+      let className = dart.dload(dart.getReifiedType(current), 'name');
       for (let name of _debugger.getOwnPropertyNames(current)) {
         if (name == 'constructor' || name == '__proto__' || dart.equals(name, className)) continue;
         if (dart.notNull(_debugger.hasMethod(object, name))) {
@@ -1588,13 +1609,13 @@ dart_library.library('dart_sdk', null, /* Imports */[
   _debugger.FunctionFormatter = class FunctionFormatter extends _debugger.Formatter {
     accept(object) {
       if (_debugger._typeof(object) != 'function') return false;
-      return dart.realRuntimeType(object) != null;
+      return dart.getReifiedType(object) != null;
     }
     hasChildren(object) {
       return true;
     }
     preview(object) {
-      return dart.as(dart.typeName(dart.realRuntimeType(object)), core.String);
+      return dart.as(dart.typeName(dart.getReifiedType(object)), core.String);
     }
     children(object) {
       return dart.list([new _debugger.NameValuePair({name: 'signature', value: this.preview(object)}), new _debugger.NameValuePair({name: 'JavaScript Function', value: object, skipDart: true})], _debugger.NameValuePair);
@@ -1671,7 +1692,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     }
     [_getType](object) {
       if (dart.is(object, core.Type)) return object;
-      return dart.realRuntimeType(object);
+      return dart.getReifiedType(object);
     }
     preview(object) {
       let entry = dart.as(object, _debugger.ClassMetadata);
@@ -8927,7 +8948,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return dart.toString(_js_helper.getRuntimeType(object));
     }
     static objectToString(object) {
-      let name = dart.typeName(dart.realRuntimeType(object));
+      let name = dart.typeName(dart.getReifiedType(object));
       return `Instance of '${name}'`;
     }
     static dateNow() {
@@ -9992,7 +10013,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   };
   dart.fn(_js_helper.stringJoinUnchecked);
   _js_helper.getRuntimeType = function(object) {
-    return dart.realRuntimeType(object);
+    return dart.getReifiedType(object);
   };
   dart.fn(_js_helper.getRuntimeType, () => dart.definiteFunctionType(core.Type, [dart.dynamic]));
   _js_helper.getIndex = function(array, index) {
@@ -29359,7 +29380,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     } else if (o instanceof Date) {
       let ms = o.getTime();
       return new core.DateTime.fromMillisecondsSinceEpoch(dart.asInt(ms));
-    } else if (dart.is(o, js._DartObject) && dart.jsobject != dart.realRuntimeType(o)) {
+    } else if (dart.is(o, js._DartObject) && dart.jsobject != dart.getReifiedType(o)) {
       return o[_dartObj];
     } else {
       return js._putIfAbsent(js._dartProxies, o, js._wrapToDart);