[MD] Implement incognito colors as a NativeTheme (for Aura).

ui/native_theme/native_theme_aura_dark.h

Index: ui/native_theme/native_theme_aura_dark.h
diff --git a/ui/native_theme/native_theme_aura_dark.h b/ui/native_theme/native_theme_aura_dark.h
new file mode 100644
index 0000000000000000000000000000000000000000..ee58e33947c70d9722ec61f801619f2273de4df4
--- /dev/null
+++ b/ui/native_theme/native_theme_aura_dark.h
@@ -0,0 +1,31 @@
+// Copyright 2015 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.
+
+#ifndef UI_NATIVE_THEME_NATIVE_THEME_AURA_OFF_THE_RECORD_H_

[sky, 2015/11/12 21:58:28]

Guards are off.

[Evan Stade, 2015/11/12 22:11:11]

Oops. I guess that presubmit check isn't turned on for this directory?

+#define UI_NATIVE_THEME_NATIVE_THEME_AURA_OFF_THE_RECORD_H_
+
+#include "base/macros.h"
+#include "ui/native_theme/native_theme_aura.h"
+
+namespace ui {
+
+// Aura implementation of native theme support for dark mode (used for
+// incognito).
+class NATIVE_THEME_EXPORT NativeThemeAuraDark : public NativeThemeAura {
+ public:
+  static NativeThemeAuraDark* instance();

[sky, 2015/11/12 21:58:29]

Should the renderer pick this up too if appropriate?

[Evan Stade, 2015/11/12 22:11:11]

I think probably not, but not entirely sure at the moment. I doubt we want the
content area to look different than normal.

+
+  // Overridden from NativeThemeBase:
+  SkColor GetSystemColor(ColorId color_id) const override;
+
+ private:
+  NativeThemeAuraDark();
+  ~NativeThemeAuraDark() override;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeThemeAuraDark);
+};
+
+}  // namespace ui
+
+#endif  // UI_NATIVE_THEME_NATIVE_THEME_AURA_H_