Implement message center on Windows

ui/views/bubble/tray_bubble_view.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_BUBBLE_TRAY_BUBBLE_VIEW_H_
 #define UI_VIEWS_BUBBLE_TRAY_BUBBLE_VIEW_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/views_export.h"
@@ skipping 14 matching lines @@
 
 namespace views {
 
 namespace internal {
 class TrayBubbleBorder;
 class TrayBubbleContentMask;
 }
 
 class VIEWS_EXPORT TrayBubbleView : public views::BubbleDelegateView {
  public:
+  // AnchorType differentiates between bubbles that are anchored on a tray
+  // element (ANCHOR_TYPE_TRAY) and display an arrow, or that are floating on
+  // the screen away from the tray (ANCHOR_TYPE_BUBBLE).
   enum AnchorType {
     ANCHOR_TYPE_TRAY,
-    ANCHOR_TYPE_BUBBLE
+    ANCHOR_TYPE_BUBBLE,
   };
 
+  // AnchorAlignment determines to which side of the anchor the bubble will
+  // align itself.
   enum AnchorAlignment {
     ANCHOR_ALIGNMENT_BOTTOM,
     ANCHOR_ALIGNMENT_LEFT,
     ANCHOR_ALIGNMENT_RIGHT,
     ANCHOR_ALIGNMENT_TOP
   };
 
   class VIEWS_EXPORT Delegate {
    public:
     typedef TrayBubbleView::AnchorType AnchorType;
@@ skipping 40 matching lines @@
     int min_width;
     int max_width;
     int max_height;
     bool can_activate;
     bool close_on_deactivate;
     SkColor arrow_color;
     views::BubbleBorder::ArrowLocation arrow_location;
     int arrow_offset;
     bool hide_arrow;  // hides arrow, but may still use "arrow geometry"
     views::BubbleBorder::Shadow shadow;
+    views::BubbleBorder::BubbleAlignment arrow_alignment;
   };
 
   // Constructs and returns a TrayBubbleView. init_params may be modified.
   static TrayBubbleView* Create(gfx::NativeView parent_window,
                                 views::View* anchor,
                                 Delegate* delegate,
                                 InitParams* init_params);
 
   virtual ~TrayBubbleView();
 
@@ skipping 63 matching lines @@
   internal::TrayBubbleBorder* bubble_border_;
   scoped_ptr<internal::TrayBubbleContentMask> bubble_content_mask_;
   bool is_gesture_dragging_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBubbleView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_TRAY_BUBBLE_VIEW_H_