Make call log requeries use background thread.

Fixes http://b/2285268
diff --git a/src/com/android/contacts/RecentCallsListActivity.java b/src/com/android/contacts/RecentCallsListActivity.java
index d892def..547cd45 100644
--- a/src/com/android/contacts/RecentCallsListActivity.java
+++ b/src/com/android/contacts/RecentCallsListActivity.java
@@ -235,6 +235,15 @@
             mLabelArray = getResources().getTextArray(com.android.internal.R.array.phoneTypes);
         }
 
+        /**
+         * Requery on background thread when {@link Cursor} changes.
+         */
+        @Override
+        protected void onContentChanged() {
+            // Start async requery
+            startQuery();
+        }
+
         void setLoading(boolean loading) {
             mLoading = loading;
         }