Merge "DOCUMENTATION ONLY: try to clarify gravity vs layout_gravity" into jb-mr1-dev

    <!-- A coordinate in the Y dimension. -->

    <attr name="y" format="dimension" />

    <!-- Specifies how to place the content of an object, both

         on the x- and y-axis, within the object itself. -->

    <!-- Specifies how an object should position its content, on both the X and Y axes,

         within its own bounds.  -->

    <attr name="gravity">

        <!-- Push object to the top of its container, not changing its size. -->

        <flag name="top" value="0x30" />

    <!-- Reference to an array resource that will populate a list/adapter. -->

    <attr name="entries" format="reference" />

    <!-- Standard gravity constant that a child can supply to its parent.

         Defines how to place the view, both its x- and y-axis, within its parent view group. -->

    <!-- Standard gravity constant that a child supplies to its parent.

         Defines how the child view should be positioned, on both the X and Y axes, within its enclosing layout. -->

    <attr name="layout_gravity">

        <!-- Push object to the top of its container, not changing its size. -->

        <flag name="top" value="0x30" />