Implement search engine auto switch when entering or leaving some locale

chrome/android/java/strings/android_chrome_strings.grd

Index: chrome/android/java/strings/android_chrome_strings.grd
diff --git a/chrome/android/java/strings/android_chrome_strings.grd b/chrome/android/java/strings/android_chrome_strings.grd
index 1c316798e52926eab8d6e17e3f68977c966d4cf8..0ac37466f1abfb174cd1333384325d7e6041194c 100644
--- a/chrome/android/java/strings/android_chrome_strings.grd
+++ b/chrome/android/java/strings/android_chrome_strings.grd
@@ -2603,6 +2603,12 @@ You can control the Physical Web in Chrome Settings.
       <message name="IDS_KEEP_GOOGLE" desc="Text representing the option that the user wants to keep Google as the default search engine.">
         Keep Google
       </message>
+      <message name="IDS_USING_SOGOU" desc="Text notifying users that the default search engine has been set to Sogou.">
+        Using Sogou for search
+      </message>
+      <message name="IDS_USING_GOOGLE" desc="Text notifying users that the default search engine has been set to Google.">
+        Using Google for search
+      </message>
 
       <!-- Item Chooser UI strings -->
       <message name="IDS_ITEM_CHOOSER_ITEM_NAME_WITH_ID" desc="To distinguish items with the same name, the item chooser shows the item name with id.">