[3/3 blink] Support redirect option of Request and "opaqueredirect" response type.

Source/core/loader/DocumentThreadableLoader.cpp

Index: Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/Source/core/loader/DocumentThreadableLoader.cpp b/Source/core/loader/DocumentThreadableLoader.cpp
index 2e13905e227776b707c16480c5983a66d2098570..72498ea1958f27e071d2bcfc6ca80a63fd084b6c 100644
--- a/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/Source/core/loader/DocumentThreadableLoader.cpp
@@ -94,6 +94,7 @@ DocumentThreadableLoader::DocumentThreadableLoader(Document& document, Threadabl
     , m_timeoutTimer(this, &DocumentThreadableLoader::didTimeout)
     , m_requestStartedSeconds(0.0)
     , m_corsRedirectLimit(kMaxCORSRedirects)
+    , m_redirectMode(request.fetchRedirectMode())
 {
     ASSERT(client);
     // Setting an outgoing referer is only supported in the async code path.
@@ -269,7 +270,14 @@ void DocumentThreadableLoader::redirectReceived(Resource* resource, ResourceRequ
 
     RefPtr<DocumentThreadableLoader> protect(this);
 
-    if (!isAllowedByContentSecurityPolicy(request.url(), ContentSecurityPolicy::DidRedirect)) {
+    if (m_redirectMode == WebURLRequest::FetchRedirectModeManual) {
+        responseReceived(resource, redirectResponse, nullptr);
+        clearResource();
+        request = ResourceRequest();
+        return;
+    }
+
+    if (m_redirectMode == WebURLRequest::FetchRedirectModeError || !isAllowedByContentSecurityPolicy(request.url(), ContentSecurityPolicy::DidRedirect)) {
         m_client->didFailRedirectCheck();
 
         clearResource();