Updates Zoom bubble layout and adds +/- buttons

ui/views/window/dialog_delegate.cc

 // 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.
 
 #include "ui/views/window/dialog_delegate.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 111 matching lines @@
   button->SetText(GetDialogButtonLabel(type));
   button->SetEnabled(IsDialogButtonEnabled(type));
   bool is_default = type == GetDefaultDialogButton();
   if (!PlatformStyle::kDialogDefaultButtonCanBeCancel &&
       type == ui::DIALOG_BUTTON_CANCEL) {
     is_default = false;
   }
   button->SetIsDefault(is_default);
 }
 
+bool DialogDelegate::ShouldSnapFrameWidth() const {
+  return true;
+}
+
 int DialogDelegate::GetDialogButtons() const {
   return ui::DIALOG_BUTTON_OK | ui::DIALOG_BUTTON_CANCEL;
 }
 
 int DialogDelegate::GetDefaultDialogButton() const {
   if (GetDialogButtons() & ui::DIALOG_BUTTON_OK)
     return ui::DIALOG_BUTTON_OK;
   if (GetDialogButtons() & ui::DIALOG_BUTTON_CANCEL)
     return ui::DIALOG_BUTTON_CANCEL;
   return ui::DIALOG_BUTTON_NONE;
@@ skipping 119 matching lines @@
   node_data->role = ui::AX_ROLE_DIALOG;
 }
 
 void DialogDelegateView::ViewHierarchyChanged(
     const ViewHierarchyChangedDetails& details) {
   if (details.is_add && details.child == this && GetWidget())
     NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 }  // namespace views