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

ui/views/controls/textfield/textfield_controller.h

Index: ui/views/controls/textfield/textfield_controller.h
diff --git a/ui/views/controls/textfield/textfield_controller.h b/ui/views/controls/textfield/textfield_controller.h
index c39f59cbf3e897322280507e1a98fd5677a2b322..973e3b2c875054cf54e1df32e2c5728d3d1bb417 100644
--- a/ui/views/controls/textfield/textfield_controller.h
+++ b/ui/views/controls/textfield/textfield_controller.h
@@ -5,12 +5,14 @@
 #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
 
@@ -49,6 +51,17 @@ class VIEWS_EXPORT TextfieldController {
   // 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) {}