Add support for providers called when the omnibox is focused.

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 e834777568883693787dcf4c8e4b69c7e797b42a..cd808884fa33da2378be28b0cec587e9a80aa893 100644
--- a/chrome/browser/autocomplete/autocomplete_controller.h
+++ b/chrome/browser/autocomplete/autocomplete_controller.h
@@ -80,10 +80,11 @@ class AutocompleteController : public AutocompleteProviderListener {
   // If |clear_result| is true, the controller will also erase the result set.
   void Stop(bool clear_result);
 
-  // Begin asynchronous fetch of zero-suggest suggestions. The |input| should
-  // contain current omnibox input, the URL of the page we are on, and
-  // that page's classification.
-  void StartZeroSuggest(const AutocompleteInput& input);
+  // Called when the omnibox is focused while no existing user input is in
+  // progress.  This is used to trigger any providers which want to provide
+  // matches in response to focus.  See
+  // AutocompleteProvider::ProvidesMatchesOnOmniboxFocus().
+  void OnOmniboxFocused(const AutocompleteInput& input);
 
   // Asks the relevant provider to delete |match|, and ensures observers are
   // notified of resulting changes immediately.  This should only be called when