Implement Non-Closable Notification

ui/views/controls/slide_out_view.h

Index: ui/views/controls/slide_out_view.h
diff --git a/ui/views/controls/slide_out_view.h b/ui/views/controls/slide_out_view.h
index 7fdb637cc7b75a9626f8fcd05595901ae1b82a9e..89962f2d317f40cb1f9be1a5f43e07179ae70725 100644
--- a/ui/views/controls/slide_out_view.h
+++ b/ui/views/controls/slide_out_view.h
@@ -19,6 +19,8 @@ class VIEWS_EXPORT SlideOutView : public views::View,
   SlideOutView();
   ~SlideOutView() override;
 
+  bool slide_out_enabled() { return is_slide_out_enabled_; }
+
  protected:
   // Called when user intends to close the View by sliding it out.
   virtual void OnSlideOut() = 0;
@@ -26,6 +28,10 @@ class VIEWS_EXPORT SlideOutView : public views::View,
   // Overridden from views::View.
   void OnGestureEvent(ui::GestureEvent* event) override;
 
+  void set_slide_out_enabled(bool is_slide_out_enabled) {
+    is_slide_out_enabled_ = is_slide_out_enabled;
+  }
+
  private:
   enum SlideDirection {
     SLIDE_LEFT,
@@ -41,7 +47,8 @@ class VIEWS_EXPORT SlideOutView : public views::View,
   // Overridden from ImplicitAnimationObserver.
   void OnImplicitAnimationsCompleted() override;
 
-  float gesture_scroll_amount_;
+  float gesture_amount_ = 0.f;
+  bool is_slide_out_enabled_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(SlideOutView);
 };