Enable Chrome to tweak search engines for some locales

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 3e98eb30a819ca82d9af6914f94fc37b0853fd75..6e9f71699fb8e7076b43a9bb45db6df6d7513b31 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
@@ -10,6 +10,10 @@ import org.chromium.chrome.browser.ChromeFeatureList;
  * Manager for some locale specific logics.
  */
 public class LocaleManager {
+    public static final String SPECIAL_LOCALE_ID = "US";
+
+    private SpecialLocaleHandler mLocaleHandler;
+
     /**
      * Starts recording metrics in deferred startup.
      */
@@ -28,6 +32,42 @@ public class LocaleManager {
     }
 
     /**
+     * @return The country id of the special locale.
+     */
+    public String getSpecialLocaleId() {
+        return SPECIAL_LOCALE_ID;
+    }
+
+    /**
+     * Adds local search engines for special locale.
+     */
+    public void addSpecialSearchEngines() {
+        // TODO(ianwen): Let this method be called in ChromeActivity#finishNativeInitialization().
+        if (!isSpecialLocaleEnabled()) return;
+        getSpecialLocaleHandler().loadTemplateUrls();
+    }
+
+    /**
+     * Overrides the default search engine to a different search engine we designate. This is a
+     * 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();
+    }
+
+    /**
+     * Removes local search engines for special locale.
+     */
+    public void removeSpecialSearchEngines() {
+        // TODO(ianwen): Let this method be called when device configuration changes.
+        if (isSpecialLocaleEnabled()) return;
+        getSpecialLocaleHandler().removeTemplateUrls();
+    }
+
+    /**
      * 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.
@@ -35,4 +75,9 @@ public class LocaleManager {
     protected boolean isReallyInSpecialLocale(boolean inSpecialLocale) {
         return inSpecialLocale;
     }
+
+    private SpecialLocaleHandler getSpecialLocaleHandler() {
+        if (mLocaleHandler == null) mLocaleHandler = new SpecialLocaleHandler(getSpecialLocaleId());
+        return mLocaleHandler;
+    }
 }