Merge "Update AnimatedImageDrawable docs" into pi-dev

/**

 * {@link Drawable} for drawing animated images (like GIF).

 *

 * <p>The framework handles decoding subsequent frames in another thread and

 * updating when necessary. The drawable will only animate while it is being

 * displayed.</p>

 *

 * <p>Created by {@link ImageDecoder#decodeDrawable}. A user needs to call

 * {@link #start} to start the animation.</p>

 *

 * <p>It can also be defined in XML using the <code>&lt;animated-image></code>

 * element.</p>

 *

 * @attr ref android.R.styleable#AnimatedImageDrawable_src

 * @attr ref android.R.styleable#AnimatedImageDrawable_autoStart

 * @attr ref android.R.styleable#AnimatedImageDrawable_repeatCount

 * @attr ref android.R.styleable#AnimatedImageDrawable_autoMirrored

 */

public class AnimatedImageDrawable extends Drawable implements Animatable2 {

    private int mIntrinsicWidth;

     *  <p>Does nothing if the animation is already running. If the animation is stopped,

     *  this will reset it.</p>

     *

     *  <p>If the animation starts, this will call

     *  {@link Animatable2.AnimationCallback#onAnimationStart}.</p>

     *  <p>When the drawable is drawn, starting the animation,

     *  {@link Animatable2.AnimationCallback#onAnimationStart} will be called.</p>

     */

    @Override

    public void start() {