More progress on triaging PackageManager callers.

Catch a bunch of simple cases where the PackageManager flags are
obvious.  Add the ability to use the MATCH_SYSTEM_ONLY flag on
PackageInfo and ApplicationInfo queries.

Re-examine recent tasks after a user is unlocked, since some of the
activities may now be available and runnable.

Bug: 26471205, 26253870
Change-Id: I989d9f8409070e5cae13202b47e2c7de85bf4a5b
diff --git a/services/core/java/com/android/server/PersistentDataBlockService.java b/services/core/java/com/android/server/PersistentDataBlockService.java
index 1249c8c..a291cc7 100644
--- a/services/core/java/com/android/server/PersistentDataBlockService.java
+++ b/services/core/java/com/android/server/PersistentDataBlockService.java
@@ -94,7 +94,8 @@
         PackageManager pm = mContext.getPackageManager();
         int allowedUid = -1;
         try {
-            allowedUid = pm.getPackageUidAsUser(allowedPackage, userHandle);
+            allowedUid = pm.getPackageUidAsUser(allowedPackage,
+                    PackageManager.MATCH_SYSTEM_ONLY, userHandle);
         } catch (PackageManager.NameNotFoundException e) {
             // not expected
             Slog.e(TAG, "not able to find package " + allowedPackage, e);