CacheStorage: Expand cache.keys() method.
Current implementation of the method is always return all of keys even if it
takes optional parameters. According to ServiceWorkerSpec[1], the method should
take a request object and cache query options[2] as optional parameters.
This CL is expanding the method as per the spec.
[1] http://slightlyoff.github.io/ServiceWorker/spec/service_worker/#cache-keys
[2] Currenly, only supports ignoreSearch option like matchAll(), delete()
BUG=520784
Review-Url: https://codereview.chromium.org/1719103002
Cr-Commit-Position: refs/heads/master@{#410868}
14 files changed
