Adding WEB_APP item type for logging.

Set in LoggerUtils.newItemTarget if instant app

Bug:67049361
Change-Id: I8e99e5c60bf1a2083f898e8978d403138f803276
diff --git a/protos/launcher_log.proto b/protos/launcher_log.proto
index 3b983d2..4013429 100644
--- a/protos/launcher_log.proto
+++ b/protos/launcher_log.proto
@@ -69,6 +69,7 @@
   EDITTEXT = 7;
   NOTIFICATION = 8;
   TASK = 9;         // Each page of Recents UI (QuickStep)
+  WEB_APP = 10;
 }
 
 // Used to define what type of container a Target would represent.