Fix LabelButtonBorder image blending.

ui/views/painter.h

 // Copyright (c) 2012 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_VIEWS_PAINTER_H_
 #define UI_VIEWS_PAINTER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPaint.h"
 #include "ui/views/views_export.h"
 
 namespace gfx {
 class Canvas;
 class ImageSkia;
 class Insets;
 class Rect;
 class Size;
 }
 
@@ skipping 44 matching lines @@
   // Top-Left/Top/Top-Right/Left/[Center]/Right/Bottom-Left/Bottom/Bottom-Right.
   static Painter* CreateImageGridPainter(const int image_ids[]);
 
   // Returns the minimum size this painter can paint without obvious graphical
   // problems (e.g. overlapping images).
   virtual gfx::Size GetMinimumSize() const = 0;
 
   // Paints the painter in the specified region.
   virtual void Paint(gfx::Canvas* canvas, const gfx::Size& size) = 0;
 
+  // Paint with custom SkPaint options; supported by a limited set of painters.
+  virtual void PaintWithSkPaint(gfx::Canvas* canvas,

[sky, 2013/06/13 16:22:04]

Do we really need this?

[msw, 2013/06/13 17:29:49]

The only alternative I see is exposing ImagePainter with this extra function.
Is there some way to set a Paint object on the canvas itself?

+                                const gfx::Size& size,
+                                const SkPaint& paint);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(Painter);
 };
 
 // HorizontalPainter paints 3 images into a box: left, center and right. The
 // left and right images are drawn to size at the left/right edges of the
 // region. The center is tiled in the remaining space. All images must have the
 // same height.
 class VIEWS_EXPORT HorizontalPainter : public Painter {
  public:
@@ skipping 16 matching lines @@
 
   // NOTE: the images are owned by ResourceBundle. Don't free them.
   const gfx::ImageSkia* images_[3];
 
   DISALLOW_COPY_AND_ASSIGN(HorizontalPainter);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_PAINTER_H_