Re-introduce the partial magnifier

chrome/browser/chromeos/accessibility/magnification_manager.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 CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_
 
 #include "chrome/browser/chromeos/accessibility/accessibility_util.h"
 
 namespace chromeos {
@@ skipping 11 matching lines @@
  public:
   // Creates an instance of MagnificationManager. This should be called once,
   // Returns the existing instance. If there is no instance, creates one.
   // because only one instance should exist at the same time.
   static void Initialize();
   // Deletes the existing instance of MagnificationManager.
   static void Shutdown();
   // Returns the existing instance. If there is no instance, returns NULL.
   static MagnificationManager* Get();
 
+  // Returns if the screen magnifier is enabled.
+  virtual bool IsMagnifierEnabled() const = 0;

[Daniel Erat, 2013/01/08 00:28:49]

nit: please add blank lines between these method names; it can be hard to read
otherwise since they all have comments

[yoshiki, 2013/01/09 03:03:15]

Done.

   // Returns the current type of the screen magnifier.
-  virtual ash::MagnifierType GetMagnifierType() = 0;
+  virtual ash::MagnifierType GetMagnifierType() const = 0;
+  // Enable the screen magnifier.
+  virtual void SetMagnifierEnabled(bool enabled) = 0;
   // Changes the type of the screen magnifier.
-  virtual void SetMagnifier(ash::MagnifierType type) = 0;
+  virtual void SetMagnifierType(ash::MagnifierType type) = 0;
 
   // Saves the magnifier scale to the pref.
   virtual void SaveScreenMagnifierScale(double scale) = 0;
   // Loads the magnifier scale from the pref.
-  virtual double GetSavedScreenMagnifierScale() = 0;
+  virtual double GetSavedScreenMagnifierScale() const = 0;
 
  protected:
   virtual ~MagnificationManager() {}
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_