Add ManagePasswordsDecoration and unit tests.

chrome/browser/ui/passwords/manage_passwords_icon.h

 // Copyright 2014 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_UI_PASSWORDS_MANAGE_PASSWORDS_ICON_H_
 #define CHROME_BROWSER_UI_PASSWORDS_MANAGE_PASSWORDS_ICON_H_
 
 #include "base/basictypes.h"
 #include "components/password_manager/core/common/password_manager_ui.h"
 
 // Abstract base class for platform-specific password management icon views.
 class ManagePasswordsIcon {
  public:
   // Get/set the icon's state. Implementations of this class must implement
   // SetStateInternal to do reasonable platform-specific things to represent
   // the icon's state to the user.
   void SetState(password_manager::ui::State state);
   password_manager::ui::State state() const { return state_; }
 
   void SetActive(bool active);
   bool active() const { return active_; }
 
  protected:
+  // The ID of the icon and text resources that are currently displayed.
+  int icon_id_;
+  int tooltip_text_id_;
+
   ManagePasswordsIcon();
   ~ManagePasswordsIcon();
 
   // Called from SetState() iff the icon's state has changed in order to do
   // whatever platform-specific UI work is necessary given the new state.
   virtual void UpdateVisibleUI() = 0;
 
  private:
+  // Updates the resource IDs in response to state changes.
+  void UpdateIDs();
+
   password_manager::ui::State state_;
   bool active_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagePasswordsIcon);
 };
 
 #endif  // CHROME_BROWSER_UI_PASSWORDS_MANAGE_PASSWORDS_ICON_H_