Add ability to theme our buttons....

views/controls/button/image_button.cc

Index: views/controls/button/image_button.cc
===================================================================
--- views/controls/button/image_button.cc	(revision 17327)
+++ views/controls/button/image_button.cc	(working copy)
@@ -19,7 +19,8 @@
 ImageButton::ImageButton(ButtonListener* listener)
     : CustomButton(listener),
       h_alignment_(ALIGN_LEFT),
-      v_alignment_(ALIGN_TOP) {
+      v_alignment_(ALIGN_TOP),
+      background_image_(NULL) {
   // By default, we request that the gfx::Canvas passed to our View::Paint()
   // implementation is flipped horizontally so that the button's bitmaps are
   // mirrored when the UI directionality is right-to-left.
@@ -33,6 +34,16 @@
   images_[aState] = anImage ? *anImage : SkBitmap();
 }
 
+void ImageButton::SetBackground(SkColor color, 
+                                SkBitmap* image, 
+                                SkBitmap* mask) {
+  if (!color && !image)
+    background_image_ = NULL;
+
+  background_image_ = new SkBitmap(
+      skia::ImageOperations::CreateButtonBackground(color, *image, *mask));
+}
+
 void ImageButton::SetImageAlignment(HorizontalAlignment h_align,
                                     VerticalAlignment v_align) {
   h_alignment_ = h_align;
@@ -68,6 +79,8 @@
     else if (v_alignment_ == ALIGN_BOTTOM)
       y = height() - img.height();
 
+    if (background_image_)
+      canvas->DrawBitmapInt(*background_image_, x, y);
     canvas->DrawBitmapInt(img, x, y);
   }
   PaintFocusBorder(canvas);