Add cross origin to Blink-driven preconnect

components/network_hints/renderer/prescient_networking_dispatcher.cc

Index: components/network_hints/renderer/prescient_networking_dispatcher.cc
diff --git a/components/network_hints/renderer/prescient_networking_dispatcher.cc b/components/network_hints/renderer/prescient_networking_dispatcher.cc
index a5599c99b0aa80209042a3d7a35516e155ab386d..47fb5ada191e5e745df276f9d0aa325bc3159f0a 100644
--- a/components/network_hints/renderer/prescient_networking_dispatcher.cc
+++ b/components/network_hints/renderer/prescient_networking_dispatcher.cc
@@ -24,9 +24,12 @@ void PrescientNetworkingDispatcher::prefetchDNS(
   dns_prefetch_.Resolve(hostname_utf8.data(), hostname_utf8.length());
 }
 
-void PrescientNetworkingDispatcher::preconnect(const blink::WebURL& url) {
+void PrescientNetworkingDispatcher::preconnect(const blink::WebURL& url,
+    const blink::CrossOriginAttributeValue crossOrigin) {
   VLOG(2) << "Preconnect: " << url.string().utf8();
-  preconnect_.Preconnect(url);
+  bool is_credentials_flag_set =
+      (crossOrigin != blink::CrossOriginAttributeAnonymous);

[Ryan Sleevi, 2015/06/11 22:20:16]

I feel like this logic should live in the //third_party/Blink layer, not in the
//components layer.

That is, for all possible implementations of preconnect(), the Web Platform
(namely, the Fetch spec) dictates what should happen. Historically, we've kept
those checks & behaviours in Blink-code.

That is, I'd expect that
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...
handles examining all of the flags and converts that into an "HTTP network
fetch" per 4.5 of https://fetch.spec.whatwg.org/#http-network-fetch

('using request with an optional credentials flag') 

I also suspect that at some point, the logic for how rel=preconnect will need to
be described in terms of Fetch, which is why I filed
https://github.com/w3c/resource-hints/issues/34 to make this clearer.

+  preconnect_.Preconnect(url, is_credentials_flag_set);
 }
 
 }  // namespace network_hints