MacViews: fix bubble direction in RTL.

ui/views/style/platform_style_mac_views_browser.mm

Index: ui/views/style/platform_style_mac_views_browser.mm
diff --git a/ui/views/style/platform_style_mac_views_browser.mm b/ui/views/style/platform_style_mac_views_browser.mm
new file mode 100644
index 0000000000000000000000000000000000000000..957ee47e7420ed7cf40be154c03899a61660ee6c
--- /dev/null
+++ b/ui/views/style/platform_style_mac_views_browser.mm
@@ -0,0 +1,13 @@
+// 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 "ui/views/style/platform_style.h"
+
+namespace views {
+
+// When the browser window is also toolkit-views, there should be full RTL
+// support, so flip by default.
+const bool PlatformStyle::kMirrorBubbleArrowInRTLByDefault = true;
+
+}  // namespace views