Plumb initiator out of Blink.

third_party/WebKit/Source/web/LocalFrameClientImpl.cpp

Index: third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp b/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
index 6d41c4722aaa74a90af2d742fd2a925c88fa42b0..37de5421228b5e03a3cf8d884f1cad51eabbd9ca 100644
--- a/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
+++ b/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
@@ -427,8 +427,13 @@ void LocalFrameClientImpl::dispatchDidStartProvisionalLoad(
     ResourceRequest& request) {
   if (m_webFrame->client()) {
     WrappedResourceRequest wrappedRequest(request);
+    DCHECK(!loader->originDocument() || loader->originDocument()->frame());
+    WebLocalFrame* initiatorFrame =
+        loader->originDocument()
+            ? WebLocalFrameImpl::fromFrame(loader->originDocument()->frame())
+            : nullptr;
     m_webFrame->client()->didStartProvisionalLoad(
-        WebDataSourceImpl::fromDocumentLoader(loader),
+        initiatorFrame, WebDataSourceImpl::fromDocumentLoader(loader),
         wrappedRequest);
   }
   if (WebDevToolsAgentImpl* devTools = devToolsAgent())
@@ -528,6 +533,7 @@ static bool allowCreatingBackgroundTabs() {
 }
 
 NavigationPolicy LocalFrameClientImpl::decidePolicyForNavigation(
+    Document* originDocument,
     const ResourceRequest& request,
     DocumentLoader* loader,
     NavigationType type,
@@ -727,11 +733,12 @@ DocumentLoader* LocalFrameClientImpl::createDocumentLoader(
     LocalFrame* frame,
     const ResourceRequest& request,
     const SubstituteData& data,
-    ClientRedirectPolicy clientRedirectPolicy) {
+    ClientRedirectPolicy clientRedirectPolicy,
+    Document* originDocument) {
   DCHECK(frame);
 
-  WebDataSourceImpl* ds =
-      WebDataSourceImpl::create(frame, request, data, clientRedirectPolicy);
+  WebDataSourceImpl* ds = WebDataSourceImpl::create(
+      frame, request, data, clientRedirectPolicy, originDocument);
   if (m_webFrame->client())
     m_webFrame->client()->didCreateDataSource(m_webFrame, ds);
   return ds;