… worklet"

This is a reland of commit f0cab8e2346b2a62aa3be1d5a41ec7737bf335af

The original CL incorrectly attempted to access
args[0].As<v8::Object>() even when the initial IDL validation
(args_converter.is_success() && !args[0]->IsObject()) failed. This
could lead to unpredictable behavior as args[0] might not be a valid
object. This reland fixes this by ensuring that
args[0].As<v8::Object>() is only accessed when
args_converter.is_success() is true.

Code changes: see the diff between Patchset 1 and Patchset 2

Original change's description:
> [shared storage] Implement sharedStorage.batchUpdate() for PA worklet
>
> Add sharedStorage.batchUpdate() function. Parse arguments into
> the 'methods' sequence and a 'with_lock' optional flag, and
> propagate the result to the browser process to invoke the
> `SharedStorageLockManager::SharedStorageBatchUpdate()` API.
>
> This allows developers to perform multiple Shared Storage operations atomically within a single lock, as part of the Web
> Lock integration proposal:
> - WICG/shared-storage#199
> - WICG/shared-storage#205
>
> Fuchsia-Binary-Size: Size increase is unavoidable.
> Bug: 373899210
> Change-Id: Ic6e9f794d78523ec9f6b87f37fb5e91f17635c58
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6072850
> Commit-Queue: Yao Xiao <yaoxia@chromium.org>
> Reviewed-by: Maks Orlovich <morlovich@chromium.org>
> Reviewed-by: Cammie Smith Barnes <cammie@chromium.org>
> Reviewed-by: Giovanni Ortuno Urquidi <ortuno@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1401673}

Bug: 373899210
Change-Id: I1782e6af1de95cc643053aa80c2a15f601da56a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6132126
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1403952}