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

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 9ce9723dcfd4dee33f8d007f61411a2bba5591d7..84f59dcff661dd2dbf1e4a599fad1864b3bea128 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -23,6 +23,7 @@
 #include "ui/aura/window_observer.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/events/event.h"
+#include "ui/base/native_theme/native_theme_aura.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
@@ -46,6 +47,10 @@
 #include "ui/base/l10n/l10n_util_win.h"
 #endif
 
+#if !defined(OS_CHROMEOS)
+#include "ui/views/widget/desktop_root_window_host.h"
+#endif
+
 namespace views {
 
 namespace {
@@ -615,6 +620,13 @@ void NativeWidgetAura::SetVisibilityChangedAnimationsEnabled(bool value) {
   window_->SetProperty(aura::client::kAnimationsDisabledKey, !value);
 }
 
+ui::NativeTheme* NativeWidgetAura::GetNativeTheme() {
+#if !defined(OS_CHROMEOS)
+  return DesktopRootWindowHost::GetNativeTheme(window_);
+#endif
+  return ui::NativeThemeAura::instance();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetAura, views::InputMethodDelegate implementation: