Allow add to homescreen and app banner strings to be changed via variations.

chrome/browser/banners/app_banner_settings_helper.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 22 matching lines @@
 // The desired effect is to have banners appear once a user has demonstrated
 // an ongoing relationship with the app, and not to pester the user too much.
 //
 // For most events only the last event is recorded. The exception are the
 // could show events. For these a list of the events is maintained. At most
 // one event is stored per day, and events outside the window the heuristic
 // uses are discarded. Local times are used to enforce these rules, to ensure
 // what we count as a day matches what the user perceives to be days.
 class AppBannerSettingsHelper {
  public:
+  // An enum for determining the title to use for the add to homescreen / app
+  // banner functionality.
+  // A Java counterpart will be generated for this enum.
+  // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.banners
+  enum LanguageOption {
+    LANGUAGE_OPTION_DEFAULT = 0,
+    LANGUAGE_OPTION_MIN = LANGUAGE_OPTION_DEFAULT,
+    LANGUAGE_OPTION_ADD = 1,
+    LANGUAGE_OPTION_INSTALL = 2,
+    LANGUAGE_OPTION_MAX = LANGUAGE_OPTION_INSTALL,
+  };
+
   // TODO(mariakhomenko): Rename events to reflect that they are used in more
   // contexts now.
   enum AppBannerEvent {
     APP_BANNER_EVENT_COULD_SHOW,
     APP_BANNER_EVENT_DID_SHOW,
     APP_BANNER_EVENT_DID_BLOCK,
     APP_BANNER_EVENT_DID_ADD_TO_HOMESCREEN,
     APP_BANNER_EVENT_NUM_EVENTS,
   };
 
@@ skipping 114 matching lines @@
   // trigger to their default values.
   static void SetDefaultParameters();
 
   // Bucket a given time to the given resolution in local time.
   static base::Time BucketTimeToResolution(base::Time time,
                                            unsigned int minutes);
 
   // Updates all values from field trial.
   static void UpdateFromFieldTrial();
 
+  // Queries variations to determine which language option should be used for
+  // app banners and add to homescreen.
+  static LanguageOption GetHomescreenLanguageOption();
+
   // Returns true if the app banner trigger condition should use the site
   // engagement score instead of the navigation-based heuristic.
   static bool ShouldUseSiteEngagementScore();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AppBannerSettingsHelper);
 };
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_