Show search engine promo dialog for special locale

chrome/android/java/src/org/chromium/chrome/browser/locale/LocaleManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/locale/LocaleManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/locale/LocaleManager.java b/chrome/android/java/src/org/chromium/chrome/browser/locale/LocaleManager.java
index 6e9f71699fb8e7076b43a9bb45db6df6d7513b31..39c012ac79ee1c9b8c1e832890493d98343e64d9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/locale/LocaleManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/locale/LocaleManager.java
@@ -4,17 +4,38 @@
 
 package org.chromium.chrome.browser.locale;
 
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import org.chromium.base.ContextUtils;
+import org.chromium.base.ThreadUtils;
+import org.chromium.chrome.browser.ChromeApplication;
 import org.chromium.chrome.browser.ChromeFeatureList;
 
 /**
  * Manager for some locale specific logics.
  */
 public class LocaleManager {
+    public static final String PREF_PROMO_SHOWN = "LocaleManager_PREF_PROMO_SHOWN";
     public static final String SPECIAL_LOCALE_ID = "US";
 
+    private static LocaleManager sInstance;
+
     private SpecialLocaleHandler mLocaleHandler;
 
     /**
+     * @return An instance of the {@link LocaleManager}. This should only be called on UI thread.
+     */
+    public static LocaleManager getInstance() {
+        assert ThreadUtils.runningOnUiThread();
+        if (sInstance == null) {
+            sInstance = ((ChromeApplication) ContextUtils.getApplicationContext())
+                    .createLocaleManager();
+        }
+        return sInstance;
+    }
+
+    /**
      * Starts recording metrics in deferred startup.
      */
     public void recordStartupMetrics() {}
@@ -52,7 +73,6 @@ public class LocaleManager {
      * no-op if the user has changed DSP settings before.
      */
     public void overrideDefaultSearchEngine() {
-        // TODO(ianwen): Let this method be called in promotion.
         // TODO(ianwen): Implement search engine auto switching.
         if (!isSpecialLocaleEnabled()) return;
         getSpecialLocaleHandler().overrideDefaultSearchProvider();
@@ -68,6 +88,25 @@ public class LocaleManager {
     }
 
     /**
+     * Shows a promotion dialog saying the default search engine will be set to Sogou. No-op if
+     * device is not in special locale.
+     *
+     * @return Whether such dialog is needed.
+     */
+    public boolean showSearchEnginePromoIfNeeded(Context context) {
+        if (!isSpecialLocaleEnabled()) return false;
+        SharedPreferences preferences = ContextUtils.getAppSharedPreferences();
+        if (preferences.getBoolean(PREF_PROMO_SHOWN, false)) {
+            return false;
+        }
+
+        new SearchEnginePromoDialog(context, this).show();
+
+        preferences.edit().putBoolean(PREF_PROMO_SHOWN, true).apply();
+        return true;
+    }
+
+    /**
      * Does some extra checking about whether the user is in special locale.
      * @param inSpecialLocale Whether the variation service thinks the client is in special locale.
      * @return The result after extra confirmation.