Reland "AppCache: Add padding to cross-origin responses."

This is a reland of 85b389caa7d725cdd31f59e9a2b79ff54804b7b7

Initialized CacheRecord::padding_size to 0.

Original change's description:
> AppCache: Add padding to cross-origin responses.
>
> Bug: 918293
> Change-Id: I4f16640f06feac009d6bbbb624951da6d2669f6c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1488059
> Commit-Queue: Staphany Park <staphany@chromium.org>
> Reviewed-by: Victor Costan <pwnall@chromium.org>
> Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#644624}

Bug: 918293
Change-Id: Ie1d3f99c7e8a854d33255a4d66243da2ce16441c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539906
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Staphany Park <staphany@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644719}
bool AppCacheUpdateJob::MaybeLoadFromNewestCache(const GURL& url,
                                                 AppCacheEntry& entry) {
  if (update_type_ != UPGRADE_ATTEMPT)
    return false;

  AppCache* newest = group_->newest_complete_cache();
  AppCacheEntry* copy_me = newest->GetEntry(url);
  if (!copy_me || !copy_me->has_response_id())
    return false;

  loading_responses_.insert(
      LoadingResponses::value_type(copy_me->response_id(), url));
  storage_->LoadResponseInfo(manifest_url_, copy_me->response_id(), this);
  return true;
}

bool AppCacheUpdateJob::MaybeLoadFromNewestCache(const GURL& url,
                                                 AppCacheEntry& entry) {
  if (update_type_ != UPGRADE_ATTEMPT)
    return false;

  AppCache* newest = group_->newest_complete_cache();
  AppCacheEntry* copy_me = newest->GetEntry(url);
  if (!copy_me || !copy_me->has_response_id())
    return false;

  loading_responses_.insert(
      LoadingResponses::value_type(copy_me->response_id(), url));
  storage_->LoadResponseInfo(manifest_url_, copy_me->response_id(), this);
  return true;
}
