[temporary M30 fix] Disable dragging tabs with web contents modal dialogs displayed

chrome/browser/ui/views/tabs/tab_strip_controller.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_UI_VIEWS_TABS_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_CONTROLLER_H_
 
 #include "chrome/browser/ui/views/tabs/tab_strip_types.h"
 #include "ui/base/ui_base_types.h"
 
@@ skipping 81 matching lines @@
 
   // Creates the new tab.
   virtual void CreateNewTab() = 0;
 
   // Returns true if the tab strip is in an incognito window.
   virtual bool IsIncognito() = 0;
 
   // Invoked if the layout type might have changed.
   virtual void LayoutTypeMaybeChanged() = 0;
 
+  // Returns true if the tab at the given index is showing a web view modal
+  // dialog.
+  virtual bool IsTabShowingWebViewModalDialog(int index) = 0;
+
   // Notifies controller that the user started dragging this tabstrip's tabs.
   virtual void OnStartedDraggingTabs() = 0;
 
   // Notifies controller that the user stopped dragging this tabstrip's tabs.
   // This is also called when the tabs that the user is dragging were detached
   // from this tabstrip but the user is still dragging the tabs.
   virtual void OnStoppedDraggingTabs() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_CONTROLLER_H_