HTML Imports: Teach preloader about HTML Imports.

Source/core/html/parser/PreloadRequest.cpp

Index: Source/core/html/parser/PreloadRequest.cpp
diff --git a/Source/core/html/parser/PreloadRequest.cpp b/Source/core/html/parser/PreloadRequest.cpp
index 9da71dc9c1e79640e2cc11bf0ec5361c13542a12..4672710f72c5e7ff014d55f5cf7798225fc6a7fa 100644
--- a/Source/core/html/parser/PreloadRequest.cpp
+++ b/Source/core/html/parser/PreloadRequest.cpp
@@ -31,6 +31,14 @@ FetchRequest PreloadRequest::resourceRequest(Document* document)
     initiatorInfo.position = m_initiatorPosition;
     FetchRequest request(ResourceRequest(completeURL(document)), initiatorInfo);
 
+    if (m_resourceType == Resource::ImportResource) {
+        SecurityOrigin* securityOrigin = document->contextDocument()->securityOrigin();
+        bool sameOrigin = securityOrigin->canRequest(request.url());
+        request.setCrossOriginAccessControl(securityOrigin,
+            sameOrigin ? AllowStoredCredentials : DoNotAllowStoredCredentials,
+            ClientDidNotRequestCredentials);
+    }
+

[Yoav Weiss, 2015/06/11 10:50:47]

OK, so that corresponds to
http://w3c.github.io/webcomponents/spec/imports/#fetching-import step 3?

Mike, can you make sure that this makes sense?

[Mike West, 2015/06/12 07:33:04]

How does this deal with redirects? Otherwise it looks reasonable.

[yoichio, 2015/06/16 05:13:09]

CrossOriginAccessControl::handleRedirect also takes care of ridirected preload
requests.

http/tests/htmlimports/redirect.html tests redirect and now the all imports in
the test are preloaded.

     if (m_isCORSEnabled)
         request.setCrossOriginAccessControl(document->securityOrigin(), m_allowCredentials);