[Mac] Location icon in omnibox as drag source.

chrome/browser/cocoa/location_bar_view_mac.h

 // Copyright (c) 2010 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 CHROME_BROWSER_COCOA_LOCATION_BAR_VIEW_MAC_H_
 #define CHROME_BROWSER_COCOA_LOCATION_BAR_VIEW_MAC_H_
 
 #include <string>
 #include <map>
 #include <vector>
@@ skipping 149 matching lines @@
 
     // Default size when no image is present.
     virtual NSSize GetDefaultImageSize() const;
 
     // Returns the size of the image, else the default size.
     NSSize GetImageSize() const;
 
     // Returns the tooltip for this image view or |nil| if there is none.
     virtual const NSString* GetToolTip() { return nil; }
 
+    // Used to determinate if the item can act as a drag source.
+    virtual bool IsDraggable() { return false; }
+
+    // The drag pasteboard to use if a drag is initiated.
+    virtual NSPasteboard* GetDragPasteboard() { return nil; }
+
     // Called on mouse down.
     virtual void OnMousePressed(NSRect bounds) {}
 
     // Called to get the icon's context menu. Return |nil| for no menu.
     virtual NSMenu* GetMenu() { return nil; }
 
    private:
     scoped_nsobject<NSImage> image_;
 
     // The label shown next to the icon, or nil if none.
     scoped_nsobject<NSAttributedString> label_;
 
     bool visible_;
 
     DISALLOW_COPY_AND_ASSIGN(LocationBarImageView);
   };
 
   // LocationIconView is used to display an icon to the left of the address.
   class LocationIconView : public LocationBarImageView {
    public:
     explicit LocationIconView(LocationBarViewMac* owner);
     virtual ~LocationIconView();
 
+    // Is draggable if the autocomplete edit view has not be changed.
+    virtual bool IsDraggable();
+
+    // Drag the URL and title from the current tab.
+    virtual NSPasteboard* GetDragPasteboard();
+
     // Shows the page info dialog.
     virtual void OnMousePressed(NSRect bounds);
 
    private:
     // The location bar view that owns us.
     LocationBarViewMac* owner_;
 
     DISALLOW_COPY_AND_ASSIGN(LocationIconView);
   };
 
@@ skipping 244 matching lines @@
   // The transition type to use for the navigation.
   PageTransition::Type transition_;
 
   // Used to register for notifications received by NotificationObserver.
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationBarViewMac);
 };
 
 #endif  // CHROME_BROWSER_COCOA_LOCATION_BAR_VIEW_MAC_H_