Re-introduce the partial magnifier

ash/test/test_shell_delegate.h

Index: ash/test/test_shell_delegate.h
diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index f7bb1710bb1247cfd9594d50ba6f70f53bb3f9e6..76add5db0447a4ba77a02fc589912e3233b9e844 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -45,7 +45,9 @@ class TestShellDelegate : public ShellDelegate {
   virtual bool IsSpokenFeedbackEnabled() const OVERRIDE;
   virtual void ToggleHighContrast() OVERRIDE;
   virtual bool IsHighContrastEnabled() const OVERRIDE;
-  virtual void SetMagnifier(MagnifierType type) OVERRIDE;
+  virtual void SetMagnifierEnabled(bool enabled) OVERRIDE;
+  virtual void SetMagnifierType(MagnifierType type) OVERRIDE;
+  virtual bool IsMagnifierEnabled() const OVERRIDE;
   virtual MagnifierType GetMagnifierType() const OVERRIDE;
   virtual bool ShouldAlwaysShowAccessibilityMenu() const OVERRIDE;
   virtual app_list::AppListViewDelegate* CreateAppListViewDelegate() OVERRIDE;
@@ -94,6 +96,7 @@ class TestShellDelegate : public ShellDelegate {
   bool session_started_;
   bool spoken_feedback_enabled_;
   bool high_contrast_enabled_;
+  bool screen_magnifier_enabled_;
   MagnifierType screen_magnifier_type_;
   bool user_logged_in_;
   bool can_lock_screen_;