Updates Zoom bubble layout and adds +/- buttons

ui/views/window/dialog_delegate.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 UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 #define UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
@@ skipping 70 matching lines @@
   // button in the dialog is Accept, Cancel() otherwise. This function should
   // return true if the window can be closed after it returns, or false if it
   // must remain open.
   virtual bool Close();
 
   // Updates the properties and appearance of |button| which has been created
   // for type |type|. Override to do special initialization above and beyond
   // the typical.
   virtual void UpdateButton(LabelButton* button, ui::DialogButton type);
 
+  // Returns true if this dialog should snap the frame width based on the
+  // LayoutProvider's snapping.
+  virtual bool ShouldSnapFrameWidth() const;
+
   // Overridden from ui::DialogModel:
   int GetDialogButtons() const override;
   int GetDefaultDialogButton() const override;
   bool ShouldDefaultButtonBeBlue() const override;
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   bool IsDialogButtonEnabled(ui::DialogButton button) const override;
 
   // Overridden from WidgetDelegate:
   View* GetInitiallyFocusedView() override;
   DialogDelegate* AsDialogDelegate() override;
@@ skipping 48 matching lines @@
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_