@Override
            public void onPostMessage(String message, Bundle extras) {
                try {
                    mCallbackBinder.onPostMessage(message, extras);
                } catch (RemoteException e) {
                    Log.e(TAG, "RemoteException during ICustomTabsCallback transaction");
                }
            }
Provides browsers a way to generate a mock {@link CustomTabsSessionToken} for testing
purposes.

@return A mock token with no functionality.
customtabs/src/android/support/customtabs/CustomTabsSessionToken.java