Share intent to used recent or often-used contacts
It is called Direct Share and described here https://developer.android.com/about/versions/marshmallow/android-6.0.html#direct-share


  This release provides you with APIs to make sharing intuitive and quick for users. You can now define direct share targets that launch a specific activity in your app. These direct share targets are exposed to users via the Share menu. This feature allows users to share content to targets, such as contacts, within other apps. For example, the direct share target might launch an activity in another social network app, which lets the user share content directly to a specific friend or community in that app.