Merge "MediaSession2: Ask server whether a controller is trusted" into pi-dev

            mInstance = instance;

            mUid = uid;

            mPackageName = packageName;

            // TODO(jaewan): Remove this workaround

            if ("com.android.server.media".equals(packageName)) {

                mIsTrusted = true;

            } else if (context.checkPermission(permission.MEDIA_CONTENT_CONTROL, pid, uid) ==

                    PackageManager.PERMISSION_GRANTED) {

                mIsTrusted = true;

            } else {

                // TODO(jaewan): Also consider enabled notification listener.

                mIsTrusted = false;

                // System apps may bind across the user so uid can be differ.

                // Skip sanity check for the system app.

                try {

                    int uidForPackage = context.getPackageManager().getPackageUid(packageName, 0);

                    if (uid != uidForPackage) {

                        throw new IllegalArgumentException("Illegal call from uid=" + uid +

                                ", pkg=" + packageName + ". Expected uid" + uidForPackage);

                    }

                } catch (NameNotFoundException e) {

                    // Rethrow exception with different name because binder methods only accept

                    // RemoteException.

                    throw new IllegalArgumentException(e);

                }

            }

            mControllerBinder = callback;

            MediaSessionManager manager =

                  (MediaSessionManager) context.getSystemService(Context.MEDIA_SESSION_SERVICE);

            // Ask server whether the controller is trusted.

            // App cannot know this because apps cannot query enabled notification listener for

            // another package, but system server can do.

            mIsTrusted = manager.isTrusted(uid, packageName);

        }

        @Override