[Android] Expose foreign session sync related funtionalities through JNI.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 2b79c8885c989de455923a37a436ddc5c07937cd..e2abbd26c37790e7409e30fae2558cddd7b9bab7 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -98,6 +98,8 @@
         'browser/android/dev_tools_server.h',
         'browser/android/favicon_helper.cc',
         'browser/android/favicon_helper.h',
+        'browser/android/foreign_session_helper.cc',
+        'browser/android/foreign_session_helper.h',
         'browser/android/google_location_settings_helper.h',
         'browser/android/intent_helper.cc',
         'browser/android/intent_helper.h',
@@ -3286,6 +3288,7 @@
             'android/java/src/org/chromium/chrome/browser/DevToolsServer.java',
             'android/java/src/org/chromium/chrome/browser/database/SQLiteCursor.java',
             'android/java/src/org/chromium/chrome/browser/favicon/FaviconHelper.java',
+            'android/java/src/org/chromium/chrome/browser/ForeignSessionHelper.java',
             'android/java/src/org/chromium/chrome/browser/IntentHelper.java',
             'android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java',
             'android/java/src/org/chromium/chrome/browser/NavigationPopup.java',