Fix LabelButtonBorder image blending.

ui/views/painter.h

Index: ui/views/painter.h
diff --git a/ui/views/painter.h b/ui/views/painter.h
index c0ff443d3ac57433f48deb672d9bde7ba0483214..06155b6174e08f789a7144b2924a87e51f756d5c 100644
--- a/ui/views/painter.h
+++ b/ui/views/painter.h
@@ -8,6 +8,7 @@
 #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 {
@@ -72,6 +73,11 @@ class VIEWS_EXPORT Painter {
   // 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,
+                                const gfx::Size& size,
+                                const SkPaint& paint);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(Painter);
 };