Single referrer for all savable resources from a given frame.

content/common/frame_messages.h

 // Copyright 2013 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 interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "content/common/content_export.h"
@@ skipping 1160 matching lines @@
 
 // Sent when the renderer runs insecure content in a secure origin.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_DidRunInsecureContent,
                     std::string /* security_origin */,
                     GURL /* target URL */)
 
 // Response to FrameMsg_GetSavableResourceLinks.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_SavableResourceLinksResponse,
                     GURL /* frame URL */,
                     std::vector<GURL> /* savable resource links */,
-                    std::vector<content::Referrer> /* referrers */)
+                    content::Referrer /* referrer for all the links above */)
 
 // Response to FrameMsg_GetSavableResourceLinks in case the frame contains
 // non-savable content (i.e. from a non-savable scheme) or if there were
 // errors gathering the links.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_SavableResourceLinksError)
 
 // Response to FrameMsg_GetSerializedHtmlWithLocalLinks.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_SerializedHtmlWithLocalLinksResponse,
                     GURL /* frame URL */,
                     std::string /* data buffer */,
                     bool /* end of data? */)
 
 // Sent when the renderer updates hint for importance of a tab.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_UpdatePageImportanceSignals,
                     content::PageImportanceSignals)
 
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
 
 // Message to show/hide a popup menu using native controls.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ShowPopup,
                     FrameHostMsg_ShowPopup_Params)
 IPC_MESSAGE_ROUTED0(FrameHostMsg_HidePopup)
 
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.