Adds View::GetNativeTheme() to get the NativeTheme. The interesting

ui/views/widget/native_widget_win.cc

Index: ui/views/widget/native_widget_win.cc
diff --git a/ui/views/widget/native_widget_win.cc b/ui/views/widget/native_widget_win.cc
index 628b0cc088cb44599cb9b71424f4fc01f405777b..0692f0d7b89de5491aa3a474461e73f110bfe8f7 100644
--- a/ui/views/widget/native_widget_win.cc
+++ b/ui/views/widget/native_widget_win.cc
@@ -21,6 +21,7 @@
 #include "ui/base/events/event.h"
 #include "ui/base/keycodes/keyboard_code_conversion_win.h"
 #include "ui/base/l10n/l10n_util_win.h"
+#include "ui/base/native_theme/native_theme.h"
 #include "ui/base/theme_provider.h"
 #include "ui/base/view_prop.h"
 #include "ui/base/win/hwnd_util.h"
@@ -484,6 +485,10 @@ void NativeWidgetWin::SetVisibilityChangedAnimationsEnabled(bool value) {
   message_handler_->SetVisibilityChangedAnimationsEnabled(value);
 }
 
+ui::NativeTheme* NativeWidgetWin::GetNativeTheme() {
+  return ui::NativeTheme::instance();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetWin, protected: