Add support for distilling current WebContents

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 9e456b7622fcc68a8339f97b936ee93c1e8047c4..f08d7fdcd52e0060ccc66df8511699b8553e77a0 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -213,6 +213,7 @@ class CONTENT_EXPORT WebContentsImpl
   virtual SiteInstance* GetSiteInstance() const OVERRIDE;
   virtual SiteInstance* GetPendingSiteInstance() const OVERRIDE;
   virtual bool IsLoading() const OVERRIDE;
+  virtual bool IsDocumentLoadedInMainFrame() const OVERRIDE;
   virtual bool IsWaitingForResponse() const OVERRIDE;
   virtual const net::LoadStateWithParam& GetLoadState() const OVERRIDE;
   virtual const base::string16& GetLoadStateHost() const OVERRIDE;
@@ -931,6 +932,9 @@ class CONTENT_EXPORT WebContentsImpl
   // Indicates whether we're currently loading a resource.
   bool is_loading_;
 
+  // Indicates whether the main frame document has been loaded.
+  bool is_document_loaded_in_main_frame_;
+
   // Indicates if the tab is considered crashed.
   base::TerminationStatus crashed_status_;
   int crashed_error_code_;