Support drag/drop on live widget search results

Preview: https://drive.google.com/file/d/1p0BMoQTaatwcslzPWoD5W_ZWQms5GpSp/view?usp=sharing

Bug: 168321831
Test: Manual
Change-Id: I237546a884083372d5d1ca80f500504b9fd9ba86
1 file changed