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..bd03b092be499cfc308134eca86254fae5f4093c 100644
--- a/chrome/browser/autocomplete/autocomplete_controller.h
+++ b/chrome/browser/autocomplete/autocomplete_controller.h
@@ -80,10 +80,10 @@ 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);
+  // Begin asynchronous fetch of suggestions to be shown when the omnibox is
+  // focused. The |input| should contain current omnibox input, the URL of the
+  // page we are on, and that page's classification.
+  void StartOnOmniboxFocus(const AutocompleteInput& input);

[Peter Kasting, 2014/12/30 21:18:23]

Nit: How about this comment and name:

  // 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);

[jif, 2014/12/31 19:02:26]

Done.

 
   // Asks the relevant provider to delete |match|, and ensures observers are
   // notified of resulting changes immediately.  This should only be called when
@@ -211,6 +211,10 @@ class AutocompleteController : public AutocompleteProviderListener {
 
   ZeroSuggestProvider* zero_suggest_provider_;
 
+  // Returns whether |providers_| contains providers that are started when the
+  // omnibox is focused.
+  bool has_providers_for_omnibox_focus_;
+
   // Input passed to Start.
   AutocompleteInput input_;