server-tools/base_user_gravatar/views/res_users_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="view_users_form_simple_modif_gravatar" model="ir.ui.view">
            <field name="name">res.users.form.gravatar</field>
            <field name="model">res.users</field>
            <field name="inherit_id" ref="base.view_users_form_simple_modif"/>
            <field name="arch" type="xml">
                <field name="name" position="after">
                    <button name="get_gravatar_image" type="object" string="Get Gravatar image" class="oe_edit_only"/>
                </field>
            </field>
        </record>

        <record id="view_users_form_gravatar" model="ir.ui.view">
            <field name="name">res.users.form.gravatar</field>
            <field name="model">res.users</field>
            <field name="inherit_id" ref="base.view_users_form"/>
            <field name="arch" type="xml">
                <field name="login" position="after">
                    <button name="get_gravatar_image" type="object" string="Get Gravatar image" class="oe_edit_only"/>
                </field>
            </field>
        </record>

    </data>
</openerp>