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 4c43d3223e0af8f2513dcd8b2623e78268269149..6a55e61d35921fb9e288f2e998328eeabf6c8143 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
@@ -34,6 +34,7 @@ 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;
@@ -114,12 +115,13 @@ 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();
@@ -176,6 +178,11 @@ public class SyncCustomizationFragment extends PreferenceFragment
             }
         });
 
+        mSyncedAccountPreference =
+                (SyncedAccountPreference) findPreference(PREFERENCE_SYNC_ACCOUNT_LIST);
+        mSyncedAccountPreference.setOnPreferenceChangeListener(new SyncAccountSwitcher(
+                getActivity(), getFragmentManager(), mSyncedAccountPreference));
+
         return view;
     }
 
@@ -272,10 +279,9 @@ public class SyncCustomizationFragment extends PreferenceFragment
     }
 
     /**
-     * Update the state of all settings from sync.
-     *
-     * This sets the state of the sync switch from external sync state and then calls
-     * updateSyncStateFromSwitch, which uses that as its source of truth.
+     * Update the state of all settings from sync. This sets the state of the sync switch from
+     * external sync state and then calls updateSyncStateFromSwitch, which uses that as its source
+     * of truth.
      */
     private void updateSyncState() {
         boolean isSyncEnabled = AndroidSyncSettings.isSyncEnabled(getActivity());
@@ -285,9 +291,7 @@ public class SyncCustomizationFragment extends PreferenceFragment
     }
 
     private void updateSyncAccountsListState() {
-        SyncedAccountPreference accountList =
-                (SyncedAccountPreference) findPreference(PREFERENCE_SYNC_ACCOUNT_LIST);
-        accountList.setEnabled(mSyncSwitchPreference.isChecked());
+        mSyncedAccountPreference.setEnabled(mSyncSwitchPreference.isChecked());
     }
 
     /**
@@ -301,12 +305,10 @@ public class SyncCustomizationFragment extends PreferenceFragment
     }
 
     /**
-     * Update the encryption state.
-     *
-     * If sync's backend is initialized, the button is enabled and the dialog will present the
-     * valid encryption options for the user. Otherwise, any encryption dialogs will be closed
-     * and the button will be disabled because the backend is needed in order to know and
-     * modify the encryption state.
+     * Update the encryption state. If sync's backend is initialized, the button is enabled and the
+     * dialog will present the valid encryption options for the user. Otherwise, any encryption
+     * dialogs will be closed and the button will be disabled because the backend is needed in order
+     * to know and modify the encryption state.
      */
     private void updateEncryptionState() {
         boolean isSyncEnabled = mSyncSwitchPreference.isChecked();
@@ -510,10 +512,8 @@ public class SyncCustomizationFragment extends PreferenceFragment
     }
 
     /**
-     * Update the state of the sync everything switch.
-     *
-     * If sync is on, load the pref from native. Otherwise display sync everything as on but
-     * disable the switch.
+     * Update the state of the sync everything switch. If sync is on, load the pref from native.
+     * Otherwise display sync everything as on but disable the switch.
      */
     private void updateSyncEverythingState() {
         boolean isSyncEnabled = mSyncSwitchPreference.isChecked();
@@ -523,11 +523,10 @@ public class SyncCustomizationFragment extends PreferenceFragment
     }
 
     /**
-     * Update the data type switch state.
-     *
-     * If sync is on, load the prefs from native. Otherwise, all data types are disabled and
-     * checked. Note that the Password data type will be shown as disabled and unchecked between
-     * sync being turned on and the backend initialization completing.
+     * Update the data type switch state. If sync is on, load the prefs from native. Otherwise, all
+     * data types are disabled and checked. Note that the Password data type will be shown as
+     * disabled and unchecked between sync being turned on and the backend initialization
+     * completing.
      */
     private void updateDataTypeState() {
         boolean isSyncEnabled = mSyncSwitchPreference.isChecked();
@@ -565,10 +564,8 @@ public class SyncCustomizationFragment extends PreferenceFragment
     }
 
     /**
-     * Listen to sync state changes.
-     *
-     * If the user has just turned on sync, this listener is needed in order to enable
-     * the encryption settings once the backend has initialized.
+     * Listen to sync state changes. If the user has just turned on sync, this listener is needed in
+     * order to enable the encryption settings once the backend has initialized.
      */
     @Override
     public void syncStateChanged() {