implement AlarmManager and JobScheduler

This is needed for the bootstrap job when setting up WhatsApp in
companion device mode.

The implementation is based on `Handler.postDelayed()`, so jobs and
alarms are not persistent for now.

src/api-impl/android/widget/TimePicker.java

@@ -0,0 +1,17 @@
+package android.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+
+public class TimePicker extends View {
+
+	public TimePicker(Context context) {
+		super(context);
+	}
+
+	public TimePicker(Context context, AttributeSet attributeSet) {
+		super(context, attributeSet);
+	}
+
+}