Teach URLRequest about initiator checks for First-Party-Only cookies.

content/browser/frame_host/navigation_request_info.h

Index: content/browser/frame_host/navigation_request_info.h
diff --git a/content/browser/frame_host/navigation_request_info.h b/content/browser/frame_host/navigation_request_info.h
index 55ac9b0159cf200e1f6d0d88c6501b8c5c0a9e21..ef677db499e08d5799bbe58ebf996d8a7e3033b8 100644
--- a/content/browser/frame_host/navigation_request_info.h
+++ b/content/browser/frame_host/navigation_request_info.h
@@ -13,6 +13,7 @@
 #include "content/common/resource_request_body.h"
 #include "content/public/common/referrer.h"
 #include "url/gurl.h"
+#include "url/origin.h"
 
 namespace content {
 class ResourceRequestBody;
@@ -24,6 +25,7 @@ struct CONTENT_EXPORT NavigationRequestInfo {
   NavigationRequestInfo(const CommonNavigationParams& common_params,
                         const BeginNavigationParams& begin_params,
                         const GURL& first_party_for_cookies,
+                        const url::Origin& request_initiator,
                         bool is_main_frame,
                         bool parent_is_main_frame,
                         int frame_tree_node_id,
@@ -37,6 +39,9 @@ struct CONTENT_EXPORT NavigationRequestInfo {
   // checked by the third-party cookie blocking policy.
   const GURL first_party_for_cookies;
 
+  // The origin of the context which initiated the request.
+  const url::Origin request_initiator;
+
   const bool is_main_frame;
   const bool parent_is_main_frame;