Sync extras bundle comparison can throw NPE

Bug: 23591205
Change-Id: I960dfcc1584c0a17685790d5d722eaf11b930e25

core/java/android/content/PeriodicSync.java

@@ -21,6 +21,8 @@ import android.os.Bundle;
 import android.os.Parcel;
 import android.accounts.Account;
 
+import java.util.Objects;
+
 /**
  * Value type that contains information about a periodic sync.
  */
@@ -147,7 +149,9 @@ public class PeriodicSync implements Parcelable {
             if (!b2.containsKey(key)) {
                 return false;
             }
-            if (!b1.get(key).equals(b2.get(key))) {
+            // Null check. According to ContentResolver#validateSyncExtrasBundle null-valued keys
+            // are allowed in the bundle.
+            if (!Objects.equals(b1.get(key), b2.get(key))) {
                 return false;
             }
         }