Add histogram Omnibox.FocusToEditTime for time in milliseconds between a user focus and edit.

chrome/browser/autocomplete/search_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 Search autocomplete provider.  This provider is
 // responsible for all autocomplete entries that start with "Search <engine>
 // for ...", including searching for the current input string, search
 // history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 
@@ skipping 86 matching lines @@
   // Update the omnibox start margin used to generate search suggestion URLs.
   void SetOmniboxStartMargin(int omnibox_start_margin);
 
   bool field_trial_triggered_in_session() const {
     return field_trial_triggered_in_session_;
   }
 
  private:
   // TODO(hfung): Remove ZeroSuggestProvider as a friend class after
   // refactoring common code to a new base class.
+  friend class SearchProviderTest;
   friend class ZeroSuggestProvider;
-  friend class SearchProviderTest;
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, NavigationInline);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, NavigationInlineDomainClassify);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, NavigationInlineSchemeSubstring);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, RemoveStaleResultsTest);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, SuggestRelevanceExperiment);
   FRIEND_TEST_ALL_PREFIXES(AutocompleteProviderTest, GetDestinationURL);
 
   // Manages the providers (TemplateURLs) used by SearchProvider. Two providers
   // may be used:
   // . The default provider. This corresponds to the user's default search
@@ skipping 405 matching lines @@
   // session.
   bool field_trial_triggered_in_session_;
 
   // Start margin of the omnibox. Used to construct search URLs.
   int omnibox_start_margin_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_