CCA: Dismiss the barcode chip when the toggle is off

Bug: b/172879638
Test: Manually.
Change-Id: Ie951d03455d9c946724a90f1a99b347cf99dcd4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603702
Commit-Queue: Shik Chen <shik@chromium.org>
Reviewed-by: Inker Kuo <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839431}

chromeos/components/camera_app_ui/resources/js/barcode_chip.js

@@ -175,3 +175,13 @@ export async function show(code) {
     showText(code);
   }
 }
+
+/**
+ * Dismisses the current barcode chip if it's being shown.
+ */
+export function dismiss() {
+  if (currentTimer === null) {
+    return;
+  }
+  currentTimer.fireNow();
+}

chromeos/components/camera_app_ui/resources/js/views/camera/preview.js

@@ -8,8 +8,8 @@ import {BarcodeScanner} from '../../models/barcode.js';
 import {DeviceOperator, parseMetadata} from '../../mojo/device_operator.js';
 import * as nav from '../../nav.js';
 import * as state from '../../state.js';
-import * as util from '../../util.js';
 import {Mode} from '../../type.js';
+import * as util from '../../util.js';
 
 /**
  * Creates a controller for the video preview of Camera view.
@@ -208,6 +208,7 @@ export class Preview {
       this.scanner_.start();
     } else {
       this.scanner_.stop();
+      barcodeChip.dismiss();
     }
   }