Make AsyncQueryHandler emit more helpful log.

The log is introduced in a5f743f1fc
We need more info for understanding what is happening.

Bug: 3204897
Change-Id: Ie2fbc838cb76757837c8dedb05055fbcc287d2b4

core/java/android/content/AsyncQueryHandler.java

@@ -85,7 +85,7 @@ public abstract class AsyncQueryHandler extends Handler {
                             cursor.getCount();
                         }
                     } catch (Exception e) {
-                        Log.w(TAG, e.toString());
+                        Log.w(TAG, "Exception thrown during handling EVENT_ARG_QUERY", e);
                         cursor = null;
                     }