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

content/common/resource_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for resource loading.
 //
 // NOTE: All messages must send an |int request_id| as their first parameter.
 
 // Multiply-included message file, hence no include guard.
 #include "base/memory/shared_memory.h"
@@ skipping 142 matching lines @@
   // The requested URL.
   IPC_STRUCT_MEMBER(GURL, url)
 
   // Usually the URL of the document in the top-level window, which may be
   // checked by the third-party cookie blocking policy. Leaving it empty may
   // lead to undesired cookie blocking. Third-party cookie blocking can be
   // bypassed by setting first_party_for_cookies = url, but this should ideally
   // only be done if there really is no way to determine the correct value.
   IPC_STRUCT_MEMBER(GURL, first_party_for_cookies)
 
+  // The origin of the context which initiated the request, which will be used
+  // fo cookie checks like 'First-Party-Only'.

[estark, 2015/10/20 23:41:58]

typo: for

[Mike West, 2015/10/22 13:17:02]

Fixed.

+  IPC_STRUCT_MEMBER(url::Origin, request_initiator)
+
   // The referrer to use (may be empty).
   IPC_STRUCT_MEMBER(GURL, referrer)
 
   // The referrer policy to use.
   IPC_STRUCT_MEMBER(blink::WebReferrerPolicy, referrer_policy)
 
   // The frame's visiblity state.
   IPC_STRUCT_MEMBER(blink::WebPageVisibilityState, visiblity_state)
 
   // Additional HTTP request headers.
@@ skipping 224 matching lines @@
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)
 
 // Sent by the renderer when a resource request changes priority.
 IPC_MESSAGE_CONTROL3(ResourceHostMsg_DidChangePriority,
                      int /* request_id */,
                      net::RequestPriority,
                      int /* intra_priority_value */)