49-Android之user版本不能执行adb_shell_am_start的问题

客户测试发现，在user版本无法执行adb shell am start指令，提示没有权限，但是在eng版本中是可以正常执行的。

因此，要求需要在user版本中也能执行adb shell am start指令。

frameworks/base/core/java/android/app/ActivityManager.java    

    @UnsupportedAppUsage
    public static int checkComponentPermission(String permission, int uid,
            int owningUid, boolean exported) {
        // Root, system server get to do everything.
        final int appId = UserHandle.getAppId(uid);
        // TODO 修改此处, 添加SHELL_UID的判断
        if (appId == Process.ROOT_UID || appId == Process.SYSTEM_UID /*TODO add begin*/|| appId == Process.SHELL_UID/*TODO add end*/) {
            return PackageManager.PERMISSION_GRANTED;
        }
        // Isolated processes don't get any permissions.
        if (UserHandle.isIsolated(uid)) {
            return PackageManager.PERMISSION_DENIED;
        }
        // If there is a uid that owns whatever is being accessed, it has
        // blanket access to it regardless of the permissions it requires.
        if (owningUid >= 0 && UserHandle.isSameApp(uid, owningUid)) {
            return PackageManager.PERMISSION_GRANTED;
        }
        // ....
    }