Fix dragging supported files to tab strip.

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 "base/strings/string16.h"
 #include "chrome/browser/ui/views/tabs/tab_strip_types.h"
 #include "ui/base/ui_base_types.h"
@@ skipping 94 matching lines @@
   // Invoked if the layout type might have changed.
   virtual void LayoutTypeMaybeChanged() = 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;
+
+  // Determines whether the file specified by the URL is supported. Should
+  // invoke TabStrip::FileSupported to report the result.

[sky, 2013/11/26 00:12:29]

Document that FileSupported() is invoked asynchronously.

[michaelpg, 2013/11/26 04:50:13]

Done.

+  virtual void CheckFileSupported(GURL url) = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_CONTROLLER_H_