[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 38 matching lines @@
     private static final String CHROME_HOME_ENABLED_KEY = "chrome_home_enabled";
 
     private static final String CHROME_DEFAULT_BROWSER = "applink.chrome_default_browser";
 
     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 URL_BAR_HINT_KEY = "url_bar_hint";
+
     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 @@
 
     /**
      * Get whether or not Chrome Home is enabled.
      * @return True if Chrome Home is enabled.
      */
     public boolean isChromeHomeEnabled() {
         return mSharedPreferences.getBoolean(CHROME_HOME_ENABLED_KEY, false);
     }
 
     /**
+     * Set hint text to show on url bar
+     * @param hint Hint text to show on url bar
+     */
+    public void setUrlBarHint(String hint) {

[mdjones, 2017/05/26 16:14:34]

Same as above; is this caching the hint or the experiment switch? Also UrlBar ->
Omnibox.

[huayinz, 2017/05/26 17:21:36]

See above^

+        writeString(URL_BAR_HINT_KEY, hint);
+    }
+
+    /**
+     * Get hint text to show on url bar
+     * @return String of hint text to show on url bar, null if not set
+     */
+    public String getUrlBarHint() {
+        return mSharedPreferences.getString(URL_BAR_HINT_KEY, null);
+    }
+
+    /**
      * 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();
     }
 }