Add views::Button style enum for LabelButton [native] styling, etc.

ui/views/controls/button/button.h

Index: ui/views/controls/button/button.h
diff --git a/ui/views/controls/button/button.h b/ui/views/controls/button/button.h
index 0563c1db291f42c61dee87984da09053d9862bfa..50180e483b0ed9306468d05db64ac02d03d9b6e6 100644
--- a/ui/views/controls/button/button.h
+++ b/ui/views/controls/button/button.h
@@ -28,6 +28,24 @@ class VIEWS_EXPORT Button : public View {
  public:
   virtual ~Button();
 
+  // Button states for various button sub-types.
+  // TODO(msw): Add toggled state for checkboxes, radio buttons, etc.
+  enum ButtonState {
+    STATE_NORMAL = 0,
+    STATE_HOVERED,
+    STATE_PRESSED,
+    STATE_DISABLED,
+    STATE_COUNT,
+  };
+
+  // Button styles with associated images and border painters.
+  // TODO(msw): Add "Chrome Style", Checkbox, Radio, Menu, ComboBox, etc.
+  enum ButtonStyle {
+    STYLE_TEXTBUTTON = 0,
+    STYLE_NATIVE_TEXTBUTTON,
+    STYLE_COUNT,
+  };
+
   void SetTooltipText(const string16& tooltip_text);
 
   int tag() const { return tag_; }