Omnibox - Zero Suggest - Log When/Whether Contextual Search is Possible

components/omnibox/browser/zero_suggest_provider.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.
 //
 // This file contains the zero-suggest autocomplete provider. This experimental
 // provider is invoked when the user focuses in the omnibox prior to editing,
 // and generates search query suggestions based on the current URL.
 
 #ifndef COMPONENTS_OMNIBOX_BROWSER_ZERO_SUGGEST_PROVIDER_H_
 #define COMPONENTS_OMNIBOX_BROWSER_ZERO_SUGGEST_PROVIDER_H_
@@ skipping 104 matching lines @@
   // service for the most visited URLs during Run().  It calls back to this
   // function to return those |urls|.
   void OnMostVisitedUrlsAvailable(const history::MostVisitedURLList& urls);
 
   // Whether we can show zero suggest without sending |current_page_url| to
   // |suggest_url| search provider. Also checks that other conditions for
   // non-contextual zero suggest are satisfied.
   bool ShouldShowNonContextualZeroSuggest(const GURL& suggest_url,
                                           const GURL& current_page_url) const;
 
+  // Returns a URL string that should be used to to request contextual
+  // suggestions from the default provider.  Does not take into account whether
+  // sending this request is prohibited (e.g., in an incognito window).  Returns
+  // an empty string in case of an error.
+  std::string GetContextualSuggestionsUrl() const;
+
   // Checks whether we have a set of zero suggest results cached, and if so
   // populates |matches_| with cached results.
   void MaybeUseCachedSuggestions();
 
   // Used for efficiency when creating the verbatim match.  Can be null.
   HistoryURLProvider* history_url_provider_;
 
   AutocompleteProviderListener* listener_;
 
   // The URL for which a suggestion fetch is pending.
@@ skipping 24 matching lines @@
   // Whether we are waiting for a most visited visited urls callback to run.
   bool waiting_for_most_visited_urls_request_;
 
   // For callbacks that may be run after destruction.
   base::WeakPtrFactory<ZeroSuggestProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ZeroSuggestProvider);
 };
 
 #endif  // COMPONENTS_OMNIBOX_BROWSER_ZERO_SUGGEST_PROVIDER_H_