Upstream the sign out and add an account dialogs.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/AddGoogleAccountDialogFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/AddGoogleAccountDialogFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/AddGoogleAccountDialogFragment.java
new file mode 100644
index 0000000000000000000000000000000000000000..dea47633d08be53f78a6a510ddfe2d889444ef49
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/AddGoogleAccountDialogFragment.java
@@ -0,0 +1,56 @@
+// 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;
+
+/**
+ * Fragment that allows user to add their Google account.
+ */
+public class AddGoogleAccountDialogFragment extends DialogFragment implements
+        DialogInterface.OnClickListener {
+
+    /**
+     * Listener for new account additions.
+     */
+    public interface AddGoogleAccountListener {
+        /**
+         * Called when the user chooses to add an account to their device.
+         */
+        public void onAddAccountClicked();
+    }
+
+    private AddGoogleAccountListener mListener;
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        return new AlertDialog.Builder(getActivity())
+                .setTitle(R.string.add_account_title)
+                .setPositiveButton(R.string.add_account_continue, this)
+                .setNegativeButton(R.string.cancel, null)
+                .setMessage(R.string.add_account_message)
+                .create();
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == AlertDialog.BUTTON_POSITIVE) {
+            if (mListener != null) mListener.onAddAccountClicked();
+        }
+    }
+
+    /**
+     * @param listener Listener that should be notified when user chooses to add an account.
+     */
+    public void setListener(AddGoogleAccountListener listener) {
+        mListener = listener;
+    }
+}