Speculative resource prefetching - fixing missing navigations due to server side redirects.

chrome/browser/net/resource_prefetch_predictor_observer.cc

Index: chrome/browser/net/resource_prefetch_predictor_observer.cc
diff --git a/chrome/browser/net/resource_prefetch_predictor_observer.cc b/chrome/browser/net/resource_prefetch_predictor_observer.cc
index 7f146006e3a1d7c9ac032e81ea74fcd98f89418a..2f45a1925359f3d0bbf8333c21adeb8e4bbb625f 100644
--- a/chrome/browser/net/resource_prefetch_predictor_observer.cc
+++ b/chrome/browser/net/resource_prefetch_predictor_observer.cc
@@ -8,6 +8,7 @@
 
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_request_info.h"
+#include "net/http/http_response_headers.h"
 #include "net/url_request/url_request.h"
 
 using content::BrowserThread;
@@ -39,6 +40,17 @@ bool SummarizeResponse(net::URLRequest* request,
   request->GetMimeType(&summary->mime_type);
   summary->was_cached = request->was_cached();
 
+  // Try to determine if this is a redirect response.
+  net::HttpResponseHeaders* headers = request->response_headers();
+  if (headers) {
+    std::string value;
+    if (headers->IsRedirect(&value)) {
+      summary->redirect_url = request->url().Resolve(value);
+      if (!summary->redirect_url.is_valid())
+        summary->redirect_url = GURL();
+    }
+  }
+
   // We want to rely on the mime_type to determine the resource type since we
   // dont want types such as PREFETCH, SUB_RESOURCE, etc.
   summary->resource_type =