[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 b0c17f2b0d7e87057d277911295e106b1c31ce65..7af4be38c94fbb256a0198eaa57ab8312f37ff5f 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -100,6 +100,8 @@
         'browser/android/favicon_helper.h',
         'browser/android/field_trial_helper.cc',
         'browser/android/field_trial_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',
@@ -3296,6 +3298,7 @@
             '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/FieldTrialHelper.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',