Created the dialog offering the user to merge their account data or keep it

chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java
index c19c7c9aedee89a2ed0146077326294b9db64f8c..2afc507e8e39ad5bc44277921d14e7066edd859a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java
@@ -36,6 +36,7 @@ import org.chromium.chrome.browser.invalidation.InvalidationController;
 import org.chromium.chrome.browser.preferences.ChromeSwitchPreference;
 import org.chromium.chrome.browser.preferences.SyncedAccountPreference;
 import org.chromium.chrome.browser.sync.ProfileSyncService;
+import org.chromium.chrome.browser.sync.SyncAccountSwitcher;
 import org.chromium.sync.AndroidSyncSettings;
 import org.chromium.sync.ModelType;
 import org.chromium.sync.PassphraseType;
@@ -116,12 +117,13 @@ public class SyncCustomizationFragment extends PreferenceFragment
     private Preference mSyncEncryption;
     private Preference mManageSyncData;
     private CheckBoxPreference[] mAllTypes;
+    private SyncedAccountPreference mSyncedAccountPreference;
 
     private ProfileSyncService mProfileSyncService;
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container,
-                             Bundle savedInstanceState) {
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         mProfileSyncService = ProfileSyncService.get();
         assert mProfileSyncService != null;
         mIsBackendInitialized = mProfileSyncService.isBackendInitialized();
@@ -178,6 +180,11 @@ public class SyncCustomizationFragment extends PreferenceFragment
             }
         });
 
+        mSyncedAccountPreference =
+                (SyncedAccountPreference) findPreference(PREFERENCE_SYNC_ACCOUNT_LIST);
+        mSyncedAccountPreference.setOnPreferenceChangeListener(
+                new SyncAccountSwitcher(getActivity(), mSyncedAccountPreference));
+
         return view;
     }