Security fixup for Slices

 - Allow slice providers to override grant flow
 - Remove overriding caller, that was a terrible idea
 - Move where the same app check happens to allow for CTS

Test: CTS
Bug: 69168488
Change-Id: I61c81c0665a08420b7bc83e3660657b62b2cd6a8
diff --git a/core/java/android/app/slice/SliceManager.java b/core/java/android/app/slice/SliceManager.java
index 67a72ec..1afe53d 100644
--- a/core/java/android/app/slice/SliceManager.java
+++ b/core/java/android/app/slice/SliceManager.java
@@ -32,9 +32,11 @@
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
+import android.os.Process;
 import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.ServiceManager.ServiceNotFoundException;
+import android.os.UserHandle;
 import android.util.Log;
 
 import com.android.internal.util.Preconditions;
@@ -392,6 +394,9 @@
      */
     public void enforceSlicePermission(Uri uri, String pkg, int pid, int uid) {
         try {
+            if (UserHandle.isSameApp(uid, Process.myUid())) {
+                return;
+            }
             if (pkg == null) {
                 throw new SecurityException("No pkg specified");
             }