Upstream the sign out and add an account dialogs.

chrome/android/java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java
new file mode 100644
index 0000000000000000000000000000000000000000..32f9246d1455d36a8d6417bae9b95461852589d3
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java
@@ -0,0 +1,75 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.signin;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.content.DialogInterface;
+import android.os.Bundle;
+
+import org.chromium.chrome.R;
+
+/**
+ * Shows the dialog that explains the user the consequences of signing out of Chrome.
+ * Calls the listener callback if the user signs out.
+ */
+public class SignOutDialogFragment extends DialogFragment implements
+        DialogInterface.OnClickListener {
+    /**
+     * Receives updates when the user clicks "Sign out" or dismisses the dialog.
+     */
+    public interface SignOutDialogListener {
+        /**
+         * Called when the user clicks "Sign out".
+         */
+        public void onSignOutClicked();
+
+        /**
+         * Called when the dialog is dismissed.
+         *
+         * @param signOutClicked Whether the user clicked the "sign out" button before the dialog
+         *                       was dismissed.
+         */
+        public void onSignOutDialogDismissed(boolean signOutClicked);
+    }
+
+    private boolean mSignOutClicked;
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        String managementDomain = SigninManager.get(getActivity()).getManagementDomain();
+        String message;
+        if (managementDomain == null) {
+            message = getActivity().getResources().getString(R.string.signout_message);
+        } else {
+            message = getActivity().getResources().getString(
+                    R.string.signout_managed_account_message, managementDomain);
+        }
+
+        return new AlertDialog.Builder(getActivity())
+                .setTitle(R.string.signout_title)
+                .setPositiveButton(R.string.ok, this)
+                .setNegativeButton(R.string.cancel, this)
+                .setMessage(message)
+                .create();
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == AlertDialog.BUTTON_POSITIVE) {
+            mSignOutClicked = true;
+            SignOutDialogListener targetFragment = (SignOutDialogListener) getTargetFragment();
+            targetFragment.onSignOutClicked();
+        }
+    }
+
+    @Override
+    public void onDismiss(DialogInterface dialog) {
+        super.onDismiss(dialog);
+        SignOutDialogListener targetFragment = (SignOutDialogListener) getTargetFragment();
+        targetFragment.onSignOutDialogDismissed(mSignOutClicked);
+    }
+}