Ash frames: dark frames now use white caption buttons.

ash/frame/default_header_painter.h

 // Copyright 2014 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 ASH_FRAME_DEFAULT_HEADER_PAINTER_H_
 #define ASH_FRAME_DEFAULT_HEADER_PAINTER_H_
 
 #include "ash/ash_export.h"
 #include "ash/frame/header_painter.h"
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
 
   // Paints the title bar, primarily the title string.
   void PaintTitleBar(gfx::Canvas* canvas);
 
   // Paints the header/content separator.
   void PaintHeaderContentSeparator(gfx::Canvas* canvas);
 
   // Layout the left header view.
   void LayoutLeftHeaderView();
 
+  // Whether light caption images should be used. This is the case when the
+  // background of the frame is dark.

[pkotwicz, 2015/02/17 18:56:42]

Nit: "caption images" -> "caption button images"

+  bool ShouldUseLightImages();
+
+  // Update all the images in the caption buttons.
+  void UpdateAllButtonImages();
+
   // Updates the size button's images.
-  void UpdateSizeButtonImages();
+  void UpdateSizeButtonImages(bool use_light_images);
 
   // Returns the header bounds in the coordinates of |view_|. The header is
   // assumed to be positioned at the top left corner of |view_| and to have the
   // same width as |view_|.
   gfx::Rect GetLocalBounds() const;
 
   // Returns the bounds for the title.
   gfx::Rect GetTitleBounds() const;
 
   // Returns the frame color to use when |frame_| is inactive.
@@ skipping 17 matching lines @@
   bool initial_paint_;
 
   scoped_ptr<gfx::SlideAnimation> activation_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultHeaderPainter);
 };
 
 }  // namespace ash
 
 #endif  // ASH_FRAME_DEFAULT_HEADER_PAINTER_H_