Use state classes for Embedded, InlineDateField and NativeButton

Make the components use pre-existing state classes..

Change-Id: Ieeb5232cf45682c64e6a0802732a8f2ea333a972

server/src/main/java/com/vaadin/ui/Embedded.java

@@ -30,6 +30,7 @@ import com.vaadin.shared.MouseEventDetails;
 import com.vaadin.shared.Registration;
 import com.vaadin.shared.ui.embedded.EmbeddedConstants;
 import com.vaadin.shared.ui.embedded.EmbeddedServerRpc;
+import com.vaadin.shared.ui.embedded.EmbeddedState;
 
 /**
  * A component for embedding external objects.
@@ -555,4 +556,13 @@ public class Embedded extends AbstractComponent implements LegacyComponent {
         // TODO Remove once LegacyComponent is no longer implemented
     }
 
+    @Override
+    protected EmbeddedState getState() {
+        return (EmbeddedState) super.getState();
+    }
+
+    @Override
+    protected EmbeddedState getState(boolean markAsDirty) {
+        return (EmbeddedState) super.getState(markAsDirty);
+    }
 }

server/src/main/java/com/vaadin/ui/InlineDateField.java

@@ -17,6 +17,8 @@ package com.vaadin.ui;
 
 import java.time.LocalDate;
 
+import com.vaadin.shared.ui.datefield.InlineDateFieldState;
+
 /**
  * A date entry component, which displays the actual date selector inline.
  *
@@ -57,4 +59,14 @@ public class InlineDateField extends AbstractDateField {
         super(caption);
     }
 
+    @Override
+    protected InlineDateFieldState getState() {
+        return (InlineDateFieldState) super.getState();
+    }
+
+    @Override
+    protected InlineDateFieldState getState(boolean markAsDirty) {
+        return (InlineDateFieldState) super.getState(markAsDirty);
+    }
+
 }

server/src/main/java/com/vaadin/ui/NativeButton.java

@@ -15,6 +15,8 @@
  */
 package com.vaadin.ui;
 
+import com.vaadin.shared.ui.button.NativeButtonState;
+
 @SuppressWarnings("serial")
 public class NativeButton extends Button {
 
@@ -30,4 +32,14 @@ public class NativeButton extends Button {
         super(caption, listener);
     }
 
+    @Override
+    protected NativeButtonState getState() {
+        return (NativeButtonState) super.getState();
+    }
+
+    @Override
+    protected NativeButtonState getState(boolean markAsDirty) {
+        return (NativeButtonState) super.getState(markAsDirty);
+    }
+
 }