Adds "on" state to file annotation command

Adds "progress" state to file annotation command

src/commands/clearFileAnnotations.ts

@@ -0,0 +1,24 @@
+'use strict';
+import { TextEditor, TextEditorEdit, Uri, window } from 'vscode';
+import { AnnotationController } from '../annotations/annotationController';
+import { Commands, EditorCommand } from './common';
+import { Logger } from '../logger';
+
+export class ClearFileAnnotationsCommand extends EditorCommand {
+
+    constructor(private annotationController: AnnotationController) {
+        super(Commands.ClearFileAnnotations);
+    }
+
+    async execute(editor: TextEditor, edit: TextEditorEdit, uri?: Uri): Promise<any> {
+        if (editor === undefined || editor.document === undefined || editor.document.isDirty) return undefined;
+
+        try {
+            return this.annotationController.clear(editor.viewColumn || -1);
+        }
+        catch (ex) {
+            Logger.error(ex, 'ClearFileAnnotationsCommand');
+            return window.showErrorMessage(`Unable to clear file annotations. See output channel for more details`);
+        }
+    }
+}