Move layout and focus ot base class

src/vs/workbench/api/electron-browser/mainThreadWebview.ts

@@ -151,14 +151,8 @@ class WebviewEditor extends BaseWebviewEditor {
 	public layout(dimension: Dimension): void {
 		if (this._webview) {
 			this.doUpdateContainer();
-			this._webview.layout();
-		}
-	}
-
-	public focus() {
-		if (this._webview) {
-			this._webview.focus();
 		}
+		super.layout(dimension);
 	}
 
 	public dispose(): void {

src/vs/workbench/parts/html/browser/htmlPreviewPart.ts

@@ -157,13 +157,8 @@ export class HtmlPreviewPart extends WebviewEditor {
 		const { width, height } = dimension;
 		this.content.style.width = `${width}px`;
 		this.content.style.height = `${height}px`;
-		if (this._webview) {
-			this._webview.layout();
-		}
-	}
 
-	public focus(): void {
-		this.webview.focus();
+		super.layout(dimension);
 	}
 
 	public clearInput(): void {

src/vs/workbench/parts/html/browser/webviewEditor.ts

@@ -12,6 +12,7 @@ import { IContextKey, RawContextKey, IContextKeyService } from 'vs/platform/cont
 
 import { Webview } from './webview';
 import { Builder } from 'vs/base/browser/builder';
+import { Dimension } from 'vs/workbench/services/part/common/partService';
 
 /**  A context key that is set when a webview editor has focus. */
 export const KEYBINDING_CONTEXT_WEBVIEWEDITOR_FOCUS = new RawContextKey<boolean>('webviewEditorFocus', false);
@@ -90,6 +91,18 @@ export abstract class WebviewEditor extends BaseWebviewEditor {
 		}
 	}
 
+	public layout(dimension: Dimension): void {
+		if (this._webview) {
+			this._webview.layout();
+		}
+	}
+
+	public focus(): void {
+		if (this._webview) {
+			this._webview.focus();
+		}
+	}
+
 	protected abstract createEditor(parent: Builder): void;
 }
 

src/vs/workbench/parts/update/electron-browser/releaseNotesEditor.ts

@@ -139,20 +139,6 @@ export class ReleaseNotesEditor extends WebviewEditor {
 		this.contentDisposables.push(toDisposable(() => this._webview = null));
 	}
 
-	layout(): void {
-		if (this._webview) {
-			this._webview.layout();
-		}
-	}
-
-	focus(): void {
-		if (!this._webview) {
-			return;
-		}
-
-		this._webview.focus();
-	}
-
 	dispose(): void {
 		this.contentDisposables = dispose(this.contentDisposables);
 		super.dispose();