CCA: Ignore exception from previous job for AsyncJobQueue

Currently when pushing new job to an AsyncJobQueue, if the previous job
throws exception, then the new job will also throw with the same
exception. This cause some weird issue like b:227292523. Fix this by
ignoring exception from previous job.

(cherry picked from commit 3786691)

Bug: b:227292523
Test: manually test that b:227292523 is no longer reproducible
Change-Id: I4ccdc4cf701e70a8f4fa0c966e08c7b5f908d296
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3599456
Auto-Submit: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#995132}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3601954
Cr-Commit-Position: refs/branch-heads/4951@{#1050}
Cr-Branched-From: 27de622-refs/heads/main@{#982481}

ash/webui/camera_app_ui/resources/js/async_job_queue.ts

@@ -14,7 +14,9 @@ export class AsyncJobQueue {
    * @return Resolved with the job return value when the job is finished.
    */
   push<T>(job: () => Promise<T>): Promise<T> {
-    const promise = this.promise.then(job);
+    const promise =
+        this.promise.catch(() => {/* ignore error from previous job */})
+            .then(job);
     this.promise = promise;
     return promise;
   }
@@ -44,12 +46,14 @@ export class ClearableAsyncJobQueue {
    *     null if the job is cleared.
    */
   push<T>(job: () => Promise<T>): Promise<T|null> {
-    const promise: Promise<T|null> = this.promise.then(() => {
-      if (this.clearing) {
-        return null;
-      }
-      return job();
-    });
+    const promise =
+        this.promise.catch(() => {/* ignore error from previous job */})
+            .then(() => {
+              if (this.clearing) {
+                return null;
+              }
+              return job();
+            });
     this.promise = promise;
     return promise;
   }