[CCA] Disable in-app zoom in-out triggered by touchpad

Bug: b/176455103
Test: Manually
Change-Id: Ibd8a82441ff9288e59550f690cbbf882eb98b6d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2620742
Commit-Queue: Wei Lee <wtlee@chromium.org>
Auto-Submit: Wei Lee <wtlee@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841929}

chromeos/components/camera_app_ui/resources/js/main.js

@@ -116,6 +116,14 @@ export class App {
 
     document.body.addEventListener('keydown', this.onKeyPressed_.bind(this));
 
+    // Disable the zoom in-out gesture which is triggered by wheel and pinch on
+    // trackpad.
+    document.body.addEventListener('wheel', (event) => {
+      if (event.ctrlKey) {
+        event.preventDefault();
+      }
+    }, {passive: false, capture: true});
+
     document.title = browserProxy.getI18nMessage('name');
     util.setupI18nElements(document.body);
     this.setupToggles_();