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 fc10074e04bd57b9466bbd38976463b504c59c7a..fa21d032f31a067828789eb87d92bfcbc01dd05b 100644
--- a/content/browser/frame_host/navigation_request_info.h
+++ b/content/browser/frame_host/navigation_request_info.h
@@ -14,6 +14,7 @@
 #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;
@@ -25,6 +26,7 @@ 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,
@@ -38,6 +40,9 @@ 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;