Make sure correct default values for ActivityStarter.

Request#reset() used different default values for the calling uid
and pid. Since reset is called before use, these the default values
were incorrect.

This changelist corrects this issue.

Change-Id: I1a04ed443fb5d9d6b248bbb1b2031d87f83f9774
Fixes: 70507511
Test: atest OsHostTests#testNonExportedActivities

services/core/java/com/android/server/am/ActivityStarter.java

@@ -317,6 +317,13 @@ class ActivityStarter {
          */
         boolean mayWait;
 
+        /**
+         * Ensure constructed request matches reset instance.
+         */
+        Request() {
+            reset();
+        }
+
         /**
          * Sets values back to the initial state, clearing any held references.
          */
@@ -332,8 +339,8 @@ class ActivityStarter {
             resultTo = null;
             resultWho = null;
             requestCode = 0;
-            callingPid = 0;
-            callingUid = 0;
+            callingPid = DEFAULT_CALLING_PID;
+            callingUid = DEFAULT_CALLING_UID;
             callingPackage = null;
             realCallingPid = 0;
             realCallingUid = 0;