Google Map is not rotated

I have this map fragment with android:rotation="90" to rotate it 90 degrees. However, it's not rotated when I run the app, why?

            <fragment
                android:rotation="90"
                android:id="@+id/map_fragment_90"
                class="com.google.android.gms.maps.SupportMapFragment"
                android:layout_width="100dp"
                android:layout_height="100dp" />

Now, it looks like this:

But, I want it to look exactly like this:

from Google Map is not rotated