Fix dynamic calls on JS interop classes.

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
index 399b4ffb276ee0c03c30b43eec6994c65849d639..d94d1a995bafd3dee2710c5e2322ac35d5c314d3 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
@@ -41,6 +41,26 @@ dload(obj, field) {
 
     if (hasField(type, f) || hasGetter(type, f)) return JS('', '#[#]', obj, f);
     if (hasMethod(type, f)) return bind(obj, f, JS('', 'void 0'));
+
+    // Always allow for JS interop objects.
+    if (isJsInterop(obj)) return JS('', '#[#]', obj, f);
+  }
+  return noSuchMethod(
+      obj, new InvocationImpl(field, JS('', '[]'), isGetter: true));
+}
+
+// Version of dload that matches legacy mirrors behavior for JS types.
+dloadMirror(obj, field) {
+  var f = _canonicalMember(obj, field);
+
+  _trackCall(obj);
+  if (f != null) {
+    var type = getType(obj);
+
+    if (hasField(type, f) || hasGetter(type, f)) return JS('', '#[#]', obj, f);
+    if (hasMethod(type, f)) return bind(obj, f, JS('', 'void 0'));
+
+    // Do not support calls on JS interop objects to match Dart2JS behavior.
   }
   return noSuchMethod(
       obj, new InvocationImpl(field, JS('', '[]'), isGetter: true));
@@ -52,24 +72,34 @@ _stripGenericArguments(type) {
   return type;
 }
 
-// Version of dput that matches legacy Dart 1 type check rules.
-// TODO(jacobr): remove this temporary workaround when mirrors based
+// Version of dput that matches legacy Dart 1 type check rules and mirrors
+// behavior for JS types.
+// TODO(jacobr): remove the type checking rules workaround when mirrors based
 // PageLoader code can generate the correct reified generic types.
-dputLegacy(obj, field, value) {
+dputMirror(obj, field, value) {
   var f = _canonicalMember(obj, field);
   _trackCall(obj);
   if (f != null) {
     var objType = getType(obj);
     var setterType = getSetterType(objType, f);
     if (JS('bool', '# != void 0', setterType)) {
-      return JS('', '#[#] = #', obj, f, check(value,  _stripGenericArguments(JS('', '#.args[0]', setterType))));
+      return JS(
+          '',
+          '#[#] = #',
+          obj,
+          f,
+          check(
+              value, _stripGenericArguments(JS('', '#.args[0]', setterType))));
     } else {
       var fieldType = getFieldType(objType, f);
       // TODO(jacobr): add metadata tracking which fields are final and throw
       // if a setter is called on a final field.
       if (JS('bool', '# != void 0', fieldType)) {
-        return JS('', '#[#] = #', obj, f, check(value, _stripGenericArguments(fieldType)));
+        return JS('', '#[#] = #', obj, f,
+            check(value, _stripGenericArguments(fieldType)));
       }
+
+      // Do not support calls on JS interop objects to match Dart2JS behavior.
     }
   }
   return noSuchMethod(
@@ -83,7 +113,8 @@ dput(obj, field, value) {
     var objType = getType(obj);
     var setterType = getSetterType(objType, f);
     if (JS('bool', '# != void 0', setterType)) {
-      return JS('', '#[#] = #', obj, f, check(value,  JS('', '#.args[0]', setterType)));
+      return JS('', '#[#] = #', obj, f,
+          check(value, JS('', '#.args[0]', setterType)));
     } else {
       var fieldType = getFieldType(objType, f);
       // TODO(jacobr): add metadata tracking which fields are final and throw
@@ -91,6 +122,10 @@ dput(obj, field, value) {
       if (JS('bool', '# != void 0', fieldType)) {
         return JS('', '#[#] = #', obj, f, check(value, fieldType));
       }
+      // Always allow for JS interop objects.
+      if (isJsInterop(obj)) {
+        return JS('', '#[#] = #', obj, f, value);
+      }
     }
   }
   return noSuchMethod(