Web Inspector: speed-up Network panel. Change _staleResources type from array to...

Web Inspector: speed-up Network panel. Change _staleResources type from array to object.
https://bugs.webkit.org/show_bug.cgi?id=69081

There is a test with 30 requests.
For the each stage of loading a resource we have an entry in _staleResources array. There are at least 4 stages per request.
NetworkLogView._refresh function is creating/updating the resource row for the each such entry.
This array can be replaced with a hash map just because the resource associated with the entry is the same for all the entries with the same request id.

Reviewed by Pavel Feldman.

Test: inspector/performance/resources/network-append-30-requests.html

* inspector/front-end/NetworkPanel.js:
(WebInspector.NetworkLogView):
(WebInspector.NetworkLogView.prototype._invalidateAllItems):
(WebInspector.NetworkLogView.prototype.refresh):
(WebInspector.NetworkLogView.prototype._reset):
(WebInspector.NetworkLogView.prototype._refreshResource):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96321 268f45cc-cd09-0410-ab3c-d52691b4dbfc