[NTP::PhysicalWeb] In OnLost invalidate by |resolved_url|.

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h

Index: components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
diff --git a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
index 67661d6c22cdbdde26c9e592ad51f6abe82ed3be..befc8ce5e4a69154439bac0b14807574e6a1dcbc 100644
--- a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
+++ b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_NTP_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_
 
+#include <map>
 #include <set>
 #include <vector>
 
@@ -90,12 +91,16 @@ class PhysicalWebPageSuggestionsProvider
   // necessary.
   void InvalidateSuggestion(const std::string& page_id);
 
+  void AppendToShownScannedUrls(
+      const std::vector<ContentSuggestion>& suggestions);
+
   // Reads dismissed IDs from Prefs.
   std::set<std::string> ReadDismissedIDsFromPrefs() const;
 
   // Writes |dismissed_ids| into Prefs.
   void StoreDismissedIDsToPrefs(const std::set<std::string>& dismissed_ids);
 
+  std::multimap<GURL, GURL> shown_resolved_urls_by_scanned_url_;
   CategoryStatus category_status_;
   const Category provided_category_;
   physical_web::PhysicalWebDataSource* physical_web_data_source_;