Android Chromoting: Add hooks for the official account-switcher

remoting/android/java/src/org/chromium/chromoting/accountswitcher/AccountSwitcherBasic.java

 // 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.chromoting.accountswitcher;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.content.Context;
+import android.content.Intent;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.LinearLayout;
 import android.widget.Spinner;
 
 import org.chromium.chromoting.AccountsAdapter;
 
 /**
  * This class implements a basic UI for a user account switcher.
  */
@@ skipping 85 matching lines @@
                 mCallback.onAccountSelected(mSelectedAccount);
             }
 
             @Override
             public void onNothingSelected(AdapterView<?> parent) {
             }
         });
 
         mCallback.onAccountSelected(mSelectedAccount);
     }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+    }
+
+    @Override
+    public void destroy() {
+    }
 }