Updates to DownloadUrlParameters in preparation for OOPIF changes

content/public/browser/resource_request_info.h

Index: content/public/browser/resource_request_info.h
diff --git a/content/public/browser/resource_request_info.h b/content/public/browser/resource_request_info.h
index 68c32fbdb947ceb65722687411589b20f12cc7e5..37a8c8ef8fd1fb0af81a4b886154e68b43dc4e64 100644
--- a/content/public/browser/resource_request_info.h
+++ b/content/public/browser/resource_request_info.h
@@ -30,6 +30,12 @@ class ResourceRequestInfo {
 
   // Allocates a new, dummy ResourceRequestInfo and associates it with the
   // given URLRequest.
+  //
+  // The RenderView routing ID must correspond to the RenderView of the
+  // RenderFrame, both of which share the same RenderProcess. This may be a
+  // different RenderView than the WebContents' main RenderView. If the
+  // download is not associated with a frame, the IDs can be all -1.
+  //
   // NOTE: Add more parameters if you need to initialize other fields.
   CONTENT_EXPORT static void AllocateForTesting(net::URLRequest* request,
                                                 ResourceType resource_type,