Refactor Textfield and AutocompleteEditViewViews.

views/controls/textfield/textfield_controller.h

Index: views/controls/textfield/textfield_controller.h
diff --git a/views/controls/textfield/textfield_controller.h b/views/controls/textfield/textfield_controller.h
index 53fe97cdd4ec37ce78f3d7d059aca7283baeabb2..ee8df1b18b13939ef44164af5e5027357cf876dc 100644
--- a/views/controls/textfield/textfield_controller.h
+++ b/views/controls/textfield/textfield_controller.h
@@ -26,6 +26,17 @@ class TextfieldController {
   // further. If it returns false the processing continues.
   virtual bool HandleKeyEvent(Textfield* sender,
                               const KeyEvent& key_event) = 0;
+
+  // Called before performing a user action that may change the textfield.
+  // It's currently only supported by Views implementation.
+  virtual void OnBeforeUserAction(Textfield* sender) {}
+
+  // Called after performing a user action that may change the textfield.
+  // It's currently only supported by Views implementation.
+  virtual void OnAfterUserAction(Textfield* sender) {}
+
+ protected:
+  virtual ~TextfieldController() {}
 };
 
 }  // namespace views