Expose the initiating origin/URL of a navigation in the Blink public API

third_party/WebKit/Source/core/loader/EmptyClients.cpp

Index: third_party/WebKit/Source/core/loader/EmptyClients.cpp
diff --git a/third_party/WebKit/Source/core/loader/EmptyClients.cpp b/third_party/WebKit/Source/core/loader/EmptyClients.cpp
index 48b3c45c6e0957883f364eb35f7892f8cc5209c8..a1854b0044f88d47cb0e4d302cbd07741d6063e7 100644
--- a/third_party/WebKit/Source/core/loader/EmptyClients.cpp
+++ b/third_party/WebKit/Source/core/loader/EmptyClients.cpp
@@ -144,7 +144,8 @@ DocumentLoader* EmptyFrameLoaderClient::createDocumentLoader(
     LocalFrame* frame,
     const ResourceRequest& request,
     const SubstituteData& substituteData,
-    ClientRedirectPolicy clientRedirectPolicy) {
+    ClientRedirectPolicy clientRedirectPolicy,
+    Document* requestorDocument) {

[dcheng, 2016/11/12 06:02:13]

I could plumb this through here as well, but I opted to only expose it in
WebDataSource, since that's the only place it's needed.

   return DocumentLoader::create(frame, request, substituteData,
                                 clientRedirectPolicy);
 }