Re-implement form validation message UI with native widgets. (Common and Mac)

chrome/common/validation_message_messages.h

Index: chrome/common/validation_message_messages.h
diff --git a/chrome/common/validation_message_messages.h b/chrome/common/validation_message_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..01b6d7f59e0c4fa740aae095b5726ca6f9c1c6a8
--- /dev/null
+++ b/chrome/common/validation_message_messages.h
@@ -0,0 +1,17 @@
+// Copyright (c) 2013 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/string16.h"
+#include "ipc/ipc_message_macros.h"
+#include "ui/gfx/rect.h"
+
+#define IPC_MESSAGE_START ValidationMessageMsgStart
+
+IPC_MESSAGE_CONTROL4(ValidationMessageMsg_ShowValidationMessage,
+                     int /* route id */,
+                     gfx::Rect /* anchor rectangle in screen coordinate */,
+                     string16 /* validation message */,
+                     string16 /* supplemental text */)
+
+IPC_MESSAGE_CONTROL0(ValidationMessageMsg_HideValidationMessage)