Prevent against NPE inside ComponentKey

b/31063280

Change-Id: I71254fc1a3244fd6834ebf65923d194f17afc1ba

src/com/android/launcher3/util/ComponentKey.java

@@ -32,8 +32,8 @@ public class ComponentKey {
     private final int mHashCode;
 
     public ComponentKey(ComponentName componentName, UserHandleCompat user) {
-        assert (componentName != null);
-        assert (user != null);
+        Preconditions.assertNotNull(componentName);
+        Preconditions.assertNotNull(user);
         this.componentName = componentName;
         this.user = user;
         mHashCode = Arrays.hashCode(new Object[] {componentName, user});
@@ -58,6 +58,8 @@ public class ComponentKey {
             componentName = ComponentName.unflattenFromString(componentKeyStr);
             user = UserHandleCompat.myUserHandle();
         }
+        Preconditions.assertNotNull(componentName);
+        Preconditions.assertNotNull(user);
         mHashCode = Arrays.hashCode(new Object[] {componentName, user});
     }