ToolbarModel: Supply offline page status.

components/toolbar/toolbar_model_delegate.h

Index: components/toolbar/toolbar_model_delegate.h
diff --git a/components/toolbar/toolbar_model_delegate.h b/components/toolbar/toolbar_model_delegate.h
index 91008e428876c12be1131f5cc8a86ca397676bc2..f0f4f171b1330b16b6e04ae47743185129109814 100644
--- a/components/toolbar/toolbar_model_delegate.h
+++ b/components/toolbar/toolbar_model_delegate.h
@@ -56,6 +56,10 @@ class ToolbarModelDelegate {
   // 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() {}
 };