Introduce static @hide PowerManager.isRebootingUserspaceSupportedImpl()

This method consolidates logic of testing whenever rebooting userspace
is supported in a place that can be used both from
PowerMager.isRebootingUserspaceSupported() API and from
PowerManagerService.reboot() implementation.

Consequently, this makes `adb shell svc power reboot userspace` also
benefit from that check, and fail userspace reboot on devices that don't
support it.

Also tweaked logic of ignoring RemoteException to take into account
userspace reboot.

Test: adb root
Test: adb shell setprop init.userspace_reboot.is_supported 0
Test: adb shell svc power reboot userspace & verified error message
Test: adb shell setprop init.userspace_reboot.is_supported 1
Test: adb shell svc power reboot userspace & verified no error message
Test: atest PowerManagerTest
Test: atest CtsUserspaceRebootHostSideTestCases
Bug: 152803929
Change-Id: I2d3a8e0ae1320c408a838c5c5fdf4cd977b167b3

1 files changed, 14 insertions, 1 deletions

diff --git a/core/java/android/os/PowerManager.java b/core/java/android/os/PowerManager.java
index b8e1aa88c3a3..be2de0edda2d 100644
--- a/core/java/android/os/PowerManager.java
+++ b/core/java/android/os/PowerManager.java
@@ -1483,12 +1483,25 @@ public final class PowerManager {
         return mInteractiveCache.query(null);
     }
 
+
+    /**
+     * Returns {@code true} if this device supports rebooting userspace.
+     *
+     * <p>This method exists solely for the sake of re-using same logic between {@code PowerManager}
+     * and {@code PowerManagerService}.
+     *
+     * @hide
+     */
+    public static boolean isRebootingUserspaceSupportedImpl() {
+        return InitProperties.is_userspace_reboot_supported().orElse(false);
+    }
+
     /**
      * Returns {@code true} if this device supports rebooting userspace.
      */
     // TODO(b/138605180): add link to documentation once it's ready.
     public boolean isRebootingUserspaceSupported() {
-        return InitProperties.is_userspace_reboot_supported().orElse(false);
+        return isRebootingUserspaceSupportedImpl();
     }
 
     /**