Plumb initiator out of Blink.

third_party/WebKit/Source/web/WebDataSourceImpl.h

Index: third_party/WebKit/Source/web/WebDataSourceImpl.h
diff --git a/third_party/WebKit/Source/web/WebDataSourceImpl.h b/third_party/WebKit/Source/web/WebDataSourceImpl.h
index 3497fed0436ef5ec797fd3656da83f4c0533234e..0c89ff4a3eec0e2a59be523cf20e884e54136351 100644
--- a/third_party/WebKit/Source/web/WebDataSourceImpl.h
+++ b/third_party/WebKit/Source/web/WebDataSourceImpl.h
@@ -43,12 +43,15 @@
 
 namespace blink {
 
+class Document;
+
 class WebDataSourceImpl final : public DocumentLoader, public WebDataSource {
  public:
   static WebDataSourceImpl* create(LocalFrame*,
                                    const ResourceRequest&,
                                    const SubstituteData&,
-                                   ClientRedirectPolicy);
+                                   ClientRedirectPolicy,
+                                   Document* originDocument);
 
   static WebDataSourceImpl* fromDocumentLoader(DocumentLoader* loader) {
     return static_cast<WebDataSourceImpl*>(loader);
@@ -87,7 +90,8 @@ class WebDataSourceImpl final : public DocumentLoader, public WebDataSource {
   WebDataSourceImpl(LocalFrame*,
                     const ResourceRequest&,
                     const SubstituteData&,
-                    ClientRedirectPolicy);
+                    ClientRedirectPolicy,
+                    Document* originDocument);
   ~WebDataSourceImpl() override;
   void detachFromFrame() override;
   String debugName() const override { return "WebDataSourceImpl"; }