[Android] Omnibox Placeholder Experiment

chrome/android/java/src/org/chromium/chrome/browser/preferences/ChromePreferenceManager.java

 // Copyright 2015 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.
 
 package org.chromium.chrome.browser.preferences;
 
 import android.content.SharedPreferences;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.SuppressFBWarnings;
@@ skipping 40 matching lines @@
     private static final String CHROME_DEFAULT_BROWSER = "applink.chrome_default_browser";
 
     private static final String CONTENT_SUGGESTIONS_SHOWN_KEY = "content_suggestions_shown";
 
     private static final String NTP_SIGNIN_PROMO_DISMISSED = "ntp.signin_promo_dismissed";
     private static final String NTP_ANIMATION_RUN_COUNT = "ntp_recycler_view_animation_run_count";
 
     private static final String SUCCESS_UPLOAD_SUFFIX = "_crash_success_upload";
     private static final String FAILURE_UPLOAD_SUFFIX = "_crash_failure_upload";
 
+    private static final String OMNIBOX_PLACEHOLDER_GROUP = "omnibox-placeholder-group";
+
     private static ChromePreferenceManager sPrefs;
 
     private final SharedPreferences mSharedPreferences;
 
     private ChromePreferenceManager() {
         mSharedPreferences = ContextUtils.getAppSharedPreferences();
     }
 
     /**
      * Get the static instance of ChromePreferenceManager if exists else create it.
@@ skipping 341 matching lines @@
     public void setSuggestionsSurfaceShown() {
         writeBoolean(CONTENT_SUGGESTIONS_SHOWN_KEY, true);
     }
 
     /** Returns whether the content suggestions surface has ever been shown. */
     public boolean getSuggestionsSurfaceShown() {
         return mSharedPreferences.getBoolean(CONTENT_SUGGESTIONS_SHOWN_KEY, false);
     }
 
     /**
+     * Set group of omnibox placeholder experiment
+     * @param group group name of omnibox placeholder experiment
+     */
+    public void setOmniboxPlaceholderGroup(String group) {
+        writeString(OMNIBOX_PLACEHOLDER_GROUP, group);
+    }
+
+    /**
+     * Get group of omnibox placeholder experiment
+     * @return String of omnibox placeholder experiment group name, empty string if not set
+     */
+    public String getOmniboxPlaceholderGroup() {
+        return mSharedPreferences.getString(OMNIBOX_PLACEHOLDER_GROUP, "");
+    }
+
+    /**
      * Writes the given int value to the named shared preference.
      * @param key The name of the preference to modify.
      * @param value The new value for the preference.
      */
     public void writeInt(String key, int value) {
         SharedPreferences.Editor ed = mSharedPreferences.edit();
         ed.putInt(key, value);
         ed.apply();
     }
 
@@ skipping 23 matching lines @@
      *
      * @param key The name of the preference to modify.
      * @param value The new value for the preference.
      */
     private void writeBoolean(String key, boolean value) {
         SharedPreferences.Editor ed = mSharedPreferences.edit();
         ed.putBoolean(key, value);
         ed.apply();
     }
 }