Add string16 and name/title support to aura::PropertyConverter.

ui/aura/mus/window_tree_client_unittest.cc

Index: ui/aura/mus/window_tree_client_unittest.cc
diff --git a/ui/aura/mus/window_tree_client_unittest.cc b/ui/aura/mus/window_tree_client_unittest.cc
index e6ed1c1fdf90d79d8c7eaa2e9cd32e0ed678624a..e776eb33fc2024292957c6b319c279462111e770 100644
--- a/ui/aura/mus/window_tree_client_unittest.cc
+++ b/ui/aura/mus/window_tree_client_unittest.cc
@@ -845,8 +845,7 @@ TEST_F(WindowTreeClientClientTest, NewWindowGetsAllChangesInFlight) {
   // But the bounds of the WindowTreeHost is display relative.
   EXPECT_EQ(bounds_from_server,
             top_level->GetRootWindow()->GetHost()->GetBounds());
-  ASSERT_TRUE(window_tree()->AckSingleChangeOfType(
-      WindowTreeChangeType::PROPERTY, false));
+  window_tree()->AckAllChangesOfType(WindowTreeChangeType::PROPERTY, false);
   EXPECT_EQ(server_test_property1_value,
             top_level->GetProperty(kTestPropertyKey1));
   EXPECT_EQ(server_test_property2_value,