Experimental AutocompleteProvider for zerosuggest.

chrome/browser/autocomplete/autocomplete_controller.h

Index: chrome/browser/autocomplete/autocomplete_controller.h
diff --git a/chrome/browser/autocomplete/autocomplete_controller.h b/chrome/browser/autocomplete/autocomplete_controller.h
index b0913172015211acc5bd258ab04b2c08cc4f172b..87a8684130c775d81249de14da0efe3264c00652 100644
--- a/chrome/browser/autocomplete/autocomplete_controller.h
+++ b/chrome/browser/autocomplete/autocomplete_controller.h
@@ -19,6 +19,7 @@ class AutocompleteControllerDelegate;
 class KeywordProvider;
 class Profile;
 class SearchProvider;
+class ZerosuggestProvider;
 
 // The AutocompleteController is the center of the autocomplete system.  A
 // class creates an instance of the controller, which in turn creates a set of
@@ -108,6 +109,14 @@ class AutocompleteController : public AutocompleteProviderListener {
   // If |clear_result| is true, the controller will also erase the result set.
   void Stop(bool clear_result);
 
+  // Begin asynchronously fetching Zerosuggest suggestions for |url|.
+  // |user_text| is the text entered in the omnibox, which may be non-empty if
+  // the user previously focused in the omnibox during this interaction.
+  void StartZerosuggest(const GURL& url, const string16& user_text);
+
+  // Cancels any pending Zerosuggest fetch.
+  void StopZerosuggest();
+
   // Asks the relevant provider to delete |match|, and ensures observers are
   // notified of resulting changes immediately.  This should only be called when
   // no query is running.
@@ -188,6 +197,8 @@ class AutocompleteController : public AutocompleteProviderListener {
 
   SearchProvider* search_provider_;
 
+  ZerosuggestProvider* zerosuggest_provider_;
+
   // Input passed to Start.
   AutocompleteInput input_;