ToolbarModel: Supply offline page status.

components/toolbar/toolbar_model_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 COMPONENTS_TOOLBAR_TOOLBAR_MODEL_DELEGATE_H_
 #define COMPONENTS_TOOLBAR_TOOLBAR_MODEL_DELEGATE_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 38 matching lines @@
 
   // Returns true if the current page fails the malware check.
   virtual bool FailsMalwareCheck() const = 0;
 
   // Returns the id of the icon to show to the left of the address, or nullptr
   // if the icon should be selected by the caller. This is useful for
   // associating particular URLs with particular schemes without importing
   // knowledge of those schemes into this component.
   virtual const gfx::VectorIcon* GetVectorIconOverride() const = 0;
 
+  // Returns whether the page is an offline page, sourced from a cache of
+  // previously-downloaded content.
+  virtual bool IsOfflinePage() const = 0;
+
  protected:
   virtual ~ToolbarModelDelegate() {}
 };
 
 #endif  // COMPONENTS_TOOLBAR_TOOLBAR_MODEL_DELEGATE_H_