DO NOT MERGE. Retain DownloadManager Uri grants when clearing.

am: 17010dc0d2

Change-Id: I7c6d507411864912937c9dbacc985cb834760cfe

core/java/android/provider/Downloads.java

@@ -41,6 +41,8 @@ public final class Downloads {
     public static final class Impl implements BaseColumns {
         private Impl() {}
 
+        public static final String AUTHORITY = "downloads";
+
         /**
          * The permission to access the download manager
          */

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

@@ -190,6 +190,7 @@ import android.os.UpdateLock;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.WorkSource;
+import android.provider.Downloads;
 import android.os.storage.IMountService;
 import android.os.storage.MountServiceInternal;
 import android.os.storage.StorageManager;
@@ -8547,6 +8548,12 @@ public final class ActivityManagerService extends ActivityManagerNative
                     // Only inspect grants matching package
                     if (packageName == null || perm.sourcePkg.equals(packageName)
                             || perm.targetPkg.equals(packageName)) {
+                        // Hacky solution as part of fixing a security bug; ignore
+                        // grants associated with DownloadManager so we don't have
+                        // to immediately launch it to regrant the permissions
+                        if (Downloads.Impl.AUTHORITY.equals(perm.uri.uri.getAuthority())
+                                && !persistable) continue;
+
                         persistChanged |= perm.revokeModes(persistable
                                 ? ~0 : ~Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION, true);