Mojo C++ bindings: make String16 and gfx::Size available in Blink

mojo/common/common_custom_types_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "mojo/common/common_custom_types.mojom.h"
@@ skipping 280 matching lines @@
   TestString16Ptr ptr;
   TestString16Impl impl(GetProxy(&ptr));
 
   base::string16 str16 = base::ASCIIToUTF16("hello world");
 
   ptr->BounceString16(str16, ExpectResponse(&str16, run_loop.QuitClosure()));
 
   run_loop.Run();
 }
 
+TEST_F(CommonCustomTypesTest, EmptyString16) {
+  base::RunLoop run_loop;
+
+  TestString16Ptr ptr;
+  TestString16Impl impl(GetProxy(&ptr));
+
+  base::string16 str16;
+
+  ptr->BounceString16(str16, ExpectResponse(&str16, run_loop.QuitClosure()));
+
+  run_loop.Run();
+}
+
 }  // namespace test
 }  // namespace common
 }  // namespace mojo