Add since tags for 8.1

client/src/main/java/com/vaadin/client/ApplicationConfiguration.java

      * resolve to.
      *
      * @return the URL of the frontend protocol
+     * @since 8.1
      */
     public String getFrontendUrl() {
         return frontendUrl;

client/src/main/java/com/vaadin/client/BrowserInfo.java

         return browserDetails.isSafari();
     }
 
+    /**
+     * Returns true if the browser is Safari or is a browser that is running on
+     * iOS and using the Safari rendering engine.
+     *
+     * @return true if the browser is using the Safari rendering engine
+     * @since 8.1
+     */
     public boolean isSafariOrIOS() {
         return browserDetails.isSafariOrIOS();
     }

client/src/main/java/com/vaadin/client/ui/VNativeSelect.java

      * Sets the number of items that are visible. If only one item is visible,
      * then the box will be displayed as a drop-down list (the default).
      *
-     * @since
+     * @since 8.1
      * @param visibleItemCount
      *            the visible item count
      */
      * Gets the number of items that are visible. If only one item is visible,
      * then the box will be displayed as a drop-down list.
      *
-     * @since
+     * @since 8.1
      * @return the visible item count
      */
     public int getVisibleItemCount() {

server/src/main/java/com/vaadin/server/WebBrowser.java

      *
      * @return <code>true</code> if the browser supports ES6, <code>false</code>
      *         otherwise.
+     * @since 8.1
      */
     public boolean isEs6Supported() {
         if (browserDetails == null) {

server/src/main/java/com/vaadin/server/osgi/BootstrapContribution.java

 import org.osgi.service.http.NamespaceException;
 
 import com.vaadin.osgi.resources.OSGiVaadinResources;
-import com.vaadin.osgi.resources.VaadinResourceService;
 import com.vaadin.osgi.resources.OSGiVaadinResources.ResourceBundleInactiveException;
+import com.vaadin.osgi.resources.VaadinResourceService;
 
+/**
+ * OSGi service component registering bootstrap JS as published resources in
+ * OSGi environments.
+ *
+ * @author Vaadin Ltd
+ * @since 8.1
+ */
 @Component(immediate = true)
 public class BootstrapContribution {
     private static final String[] RESOURCES = { "vaadinBootstrap.js",
 
     @Reference
     void setHttpService(HttpService service) {
-        this.httpService = service;
+        httpService = service;
     }
 
     void unsetHttpService(HttpService service) {
-        this.httpService = null;
+        httpService = null;
     }
 }

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

      * Sets the number of items that are visible. If only one item is visible,
      * then the box will be displayed as a drop-down list (the default).
      *
-     * @since
+     * @since 8.1
      * @param visibleItemCount
      *            the visible item count
      * @throws IllegalArgumentException
      * Gets the number of items that are visible. If only one item is visible,
      * then the box will be displayed as a drop-down list.
      *
-     * @since
+     * @since 8.1
      * @return the visible item count
      */
     public int getVisibleItemCount() {

shared/src/main/java/com/vaadin/shared/ApplicationConstants.java

     public static final String PUBLISHED_PROTOCOL_NAME = "published";
     public static final String PUBLISHED_PROTOCOL_PREFIX = PUBLISHED_PROTOCOL_NAME
             + "://";
+    /**
+     * An internal protocol used for referencing frontend resources.
+     *
+     * @see #FRONTEND_URL
+     *
+     * @since 8.1
+     */
     public static final String FRONTEND_PROTOCOL_PREFIX = "frontend://";
 
     /**
      * <p>
      * By default, this is "vaadin://es6" ("vaadin://es5" for browsers which
      * does not support ES6).
+     *
+     * @since 8.1
      */
     public static final String FRONTEND_URL = "frontendUrl";
 
     /**
      * Configuration name for the {@literal frontend://} URL when using a
      * browser which is not ES6 compatible (i.e. IE11 or Safari 9).
+     *
+     * @since 8.1
      */
     public static final String FRONTEND_URL_ES5 = "frontend.url.es5";
 
     /**
      * Configuration name for the {@literal frontend://} URL when using an ES6
      * compatible browser.
+     *
+     * @since 8.1
      */
     public static final String FRONTEND_URL_ES6 = "frontend.url.es6";
 
     /**
      * Default value of the configuration of the build URL of ES6 web
      * components.
+     *
+     * @since 8.1
      */
     public static final String FRONTEND_URL_ES6_DEFAULT_VALUE = VAADIN_PROTOCOL_PREFIX
             + "frontend/es6/";
     /**
      * Default value of the configuration of the build URL of ES5 web
      * components.
+     *
+     * @since 8.1
      */
     public static final String FRONTEND_URL_ES5_DEFAULT_VALUE = VAADIN_PROTOCOL_PREFIX
             + "frontend/es5/";

shared/src/main/java/com/vaadin/shared/VBrowserDetails.java

      * iOS).
      *
      * @return true if it is Safari or running on IOS, false otherwise
+     * @since 8.1
      */
     public boolean isSafariOrIOS() {
         return isSafari() || isIOS();
         return false;
     }
 
+    /**
+     * Checks whether the browser should support ES6 based on its vendor and
+     * version number.
+     *
+     * @return true if the browser supports ES6
+     * @since 8.1
+     */
     public boolean isEs6Supported() {
         if (isTooOldToFunctionProperly()) {
             return false;

shared/src/main/java/com/vaadin/shared/VaadinUriResolver.java

      *
      * @return the absolute or relative URL to the frontend files, ending with a
      *         slash '/'
+     * @since 8.1
      */
     protected abstract String getFrontendUrl();
 }

shared/src/main/java/com/vaadin/shared/ui/nativeselect/NativeSelectState.java

      */
     public String emptySelectionCaption = "";
 
+    /**
+     * The number of items that are visible. If only one item is visible, then
+     * the box will be displayed as a drop-down list.
+     *
+     * @since 8.1
+     */
     @DelegateToWidget
     public int visibleItemCount = 1;