Add boot animation progress system property.

Test: m
Bug: 175686819
Change-Id: Ic2757054b908e2c7ff51e256e8683616df74fb33

init/reboot.cpp

@@ -655,6 +655,7 @@ static void DoReboot(unsigned int cmd, const std::string& reason, const std::str
 
         if (do_shutdown_animation) {
             SetProperty("service.bootanim.exit", "0");
+            SetProperty("service.bootanim.progress", "0");
             // Could be in the middle of animation. Stop and start so that it can pick
             // up the right mode.
             boot_anim->Stop();

rootdir/init.rc

@@ -1072,6 +1072,7 @@ on property:vold.decrypt=trigger_restart_framework
     class_start main
     class_start late_start
     setprop service.bootanim.exit 0
+    setprop service.bootanim.progress 0
     start bootanim
 
 on property:vold.decrypt=trigger_shutdown_framework
@@ -1173,6 +1174,7 @@ on userspace-reboot-requested
   setprop sys.user.0.ce_available ""
   setprop sys.shutdown.requested ""
   setprop service.bootanim.exit ""
+  setprop service.bootanim.progress ""
 
 on userspace-reboot-fs-remount
   # Make sure that vold is running.