Merge "Improve javadoc for OnReceiveContentListener.onReceiveContent" into sc-dev am: 5177dab6

     * preserve the common behavior for inserting text. See the class javadoc for a sample

     * implementation.

     *

     * <p>If implementing handling for text: if the view has a selection, the selection should

     * be overwritten by the passed-in content; if there's no selection, the passed-in content

     * should be inserted at the current cursor position.

     *

     * <p>If implementing handling for non-text content (e.g. images): the content may be

     * inserted inline, or it may be added as an attachment (could potentially be shown in a

     * <p>Handling different content

     * <ul>

     *     <li>Text. If the {@link ContentInfo#getSource() source} is

     *     {@link ContentInfo#SOURCE_AUTOFILL autofill}, the view's content should be fully

     *     replaced by the passed-in text. For sources other than autofill, the passed-in text

     *     should overwrite the current selection or be inserted at the current cursor position

     *     if there is no selection.

     *     <li>Non-text content (e.g. images). The content may be inserted inline if the widget

     *     supports this, or it may be added as an attachment (could potentially be shown in a

     *     completely separate view).

     * </ul>

     *

     * @param view The view where the content insertion was requested.

     * @param payload The content to insert and related metadata.