Add icon to App Indexing Quickstart
Add icon to App Indexing Quickstart

Bug: 28073415
Change-Id: I9a42388472cfe51720f27e407152a48a3008b6d1

firebase/quickstart-android,samtstern/quickstart-android,AJHill37/LFG,firebase/quickstart-android,firebase/quickstart-android,firebase/quickstart-android,hbmartin/sub9-client,AJHill37/LFG,firebase/quickstart-android,AJHill37/LFG,samtstern/quickstart-android,samtstern/quickstart-android,hbmartin/sub9-client,firebase/quickstart-android