Omnibox should accept and navigate URLs dropped using drag and drop.

ui/views/controls/textfield/textfield_controller.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_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_
 
+#include <set>
+
 #include "base/string16.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/views/views_export.h"
 
 namespace ui {
 class KeyEvent;
-class OSExchangeData;
 class SimpleMenuModel;
 }  // namespace ui
 
 namespace views {
 
 class Textfield;
 
 // This defines the callback interface for other code to be notified of changes
 // in the state of a text field.
 class VIEWS_EXPORT TextfieldController {
@@ skipping 18 matching lines @@
   // It's currently only supported by Views implementation.
   virtual void OnAfterUserAction(Textfield* sender) {}
 
   // Called after performing a Cut or Copy operation.
   virtual void OnAfterCutOrCopy() {}
 
   // Called after the textfield has written drag data to give the controller a
   // chance to modify the drag data.
   virtual void OnWriteDragData(ui::OSExchangeData* data) {}
 
+  // Enables the controller to append to the accepted drop formats.
+  virtual void AppendDropFormats(
+      int* formats,
+      std::set<ui::OSExchangeData::CustomFormat>* custom_formats) {}
+
+  // Called when a drop of dragged data happens on the textfield. This method is
+  // called before regular handling of the drop. If this returns a drag
+  // operation other than |ui::DragDropTypes::DRAG_NONE|, regular handling is
+  // skipped.
+  virtual int OnDrop(const ui::OSExchangeData& data);
+
   // Gives the controller a chance to modify the context menu contents.
   virtual void UpdateContextMenu(ui::SimpleMenuModel* menu_contents) {}
 
   // Returns true if the |command_id| should be enabled in the context menu.
   virtual bool IsCommandIdEnabled(int command_id) const;
 
   // Returns true if the item label for the |command_id| is dynamic in the
   // context menu.
   virtual bool IsItemForCommandIdDynamic(int command_id) const;
 
@@ skipping 10 matching lines @@
   // Execute context menu command specified by |command_id|.
   virtual void ExecuteCommand(int command_id) {}
 
  protected:
   virtual ~TextfieldController() {}
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_