Merge "Improve javadoc for DynamicSystemClient"

 * <p>This class contains methods and constants used to start a {@code DynamicSystem} installation,

 * and a listener for status updates.</p>

 *

 * <p>{@code DynamicSystem} allows user to run certified system images in a non destructive manner

 * without needing to prior OEM unlock. While running in {@code DynamicSystem}, persitent storage

 * for factory reset protection (FRP) remains unchanged. The new system is installed in a

 * temporarily allocated partition. After the installation is completed, the device will be running

 * in the new system on next reboot. Then, when the user reboots the device again, it will leave

 * {@code DynamicSystem} and go back into the original system. Since the userdata for

 * {@code DynamicSystem} is also newly created during the installation, running in

 * {@code DynamicSystem} doesn't change user's app data.</p>

 * <p>{@code DynamicSystem} allows users to run certified system images in a non destructive manner

 * without needing to prior OEM unlock. It creates a temporary system partition to install the new

 * system image, and a temporary data partition for the newly installed system to run with.</p>

 *

 * After the installation is completed, the device will be running in the new system on next the

 * reboot. Then, when the user reboots the device again, it will leave {@code DynamicSystem} and go

 * back to the original system. While running in {@code DynamicSystem}, persitent storage for

 * factory reset protection (FRP) remains unchanged. Since the user is running the new system with

 * a temporarily created data partition, their original user data are kept unchanged.</p>

 *

 * <p>With {@link #setOnStatusChangedListener}, API users can register an

 * {@link #OnStatusChangedListener} and get status updates and cause when the installation is

 * {@link #OnStatusChangedListener} to get status updates and their causes when the installation is

 * started, stopped, or cancelled. It also sends progress updates during the installation. With

 * {@link #start}, API users can start an installation with the {@link Uri} to a gzipped system

 * image. The {@link Uri} can be a web URL or a content Uri to a local path.</p>

 * {@link #start}, API users can start an installation with the {@link Uri} to a unsparsed and

 * gzipped system image. The {@link Uri} can be a web URL or a content Uri to a local path.</p>

 *

 * @hide

 */