Add comments for completeness

src/core/viewport.ts

  */
 class InlineResizeStrategy extends ViewportResizeStrategy
 {
+    /**
+     * Resize the viewport
+     * @param viewport
+     */
     resize(viewport: Viewport): void
     {
         const container = viewport.container;
  */
 abstract class ImmersiveResizeStrategy extends ViewportResizeStrategy
 {
+    /**
+     * Resize the viewport
+     * @param viewport
+     */
     resize(viewport: Viewport): void
     {
         const CONTAINER_ZINDEX = 1000000000;
  */
 class BestFitResizeStrategy extends ImmersiveResizeStrategy
 {
+    /**
+     * Resize the viewport
+     * @param viewport
+     */
     resize(viewport: Viewport): void
     {
         const subContainer = viewport._subContainer;
  */
 class StretchResizeStrategy extends ImmersiveResizeStrategy
 {
+    /**
+     * Resize the viewport
+     * @param viewport
+     */
     resize(viewport: Viewport): void
     {
         const subContainer = viewport._subContainer;