Implement search engine auto switch when entering or leaving some locale

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

 // Copyright 2016 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.locale;
 
 /**
  * A Handler for changes in a given special locale. This is a JNI bridge and it owns the native
  * object. Make sure to call Destroy() after this object is not used anymore.
  */
@@ skipping 44 matching lines @@
     }
 
     /**
      * Overrides the default search provider in special locale.
      */
     public void overrideDefaultSearchProvider() {
         assert mNativeSpecialLocaleHandler != 0;
         nativeOverrideDefaultSearchProvider(mNativeSpecialLocaleHandler);
     }
 
+    /**
+     * Sets the default search provider back to Google.
+     */
+    public void setGoogleAsDefaultSearch() {
+        assert mNativeSpecialLocaleHandler != 0;
+        nativeSetGoogleAsDefaultSearch(mNativeSpecialLocaleHandler);
+    }
+
     private static native long nativeInit(String localeId);
     private static native void nativeDestroy(long nativeSpecialLocaleHandler);
     private static native boolean nativeLoadTemplateUrls(long nativeSpecialLocaleHandler);
     private static native void nativeRemoveTemplateUrls(long nativeSpecialLocaleHandler);
     private static native void nativeOverrideDefaultSearchProvider(long nativeSpecialLocaleHandler);
+    private static native void nativeSetGoogleAsDefaultSearch(long nativeSpecialLocaleHandler);
 }