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

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 203 matching lines @@
   visitor->trace(m_provisionalItem);
   visitor->trace(m_deferredHistoryLoad);
 }
 
 void FrameLoader::init() {
   ResourceRequest initialRequest(KURL(ParsedURLString, emptyString()));
   initialRequest.setRequestContext(WebURLRequest::RequestContextInternal);
   initialRequest.setFrameType(m_frame->isMainFrame()
                                   ? WebURLRequest::FrameTypeTopLevel
                                   : WebURLRequest::FrameTypeNested);
-  m_provisionalDocumentLoader =
-      client()->createDocumentLoader(m_frame, initialRequest, SubstituteData(),
-                                     ClientRedirectPolicy::NotClientRedirect);
+  m_provisionalDocumentLoader = client()->createDocumentLoader(
+      m_frame, initialRequest, SubstituteData(),
+      ClientRedirectPolicy::NotClientRedirect, nullptr);
   m_provisionalDocumentLoader->startLoadingMainResource();
   m_frame->document()->cancelParsing();
   m_stateMachine.advanceTo(
       FrameLoaderStateMachine::DisplayingInitialEmptyDocument);
   // Self-suspend if created in an already deferred Page. Note that both
   // startLoadingMainResource() and cancelParsing() may have already detached
   // the frame, since they both fire JS events.
   if (m_frame->page() && m_frame->page()->defersLoading())
     setDefersLoading(true);
   takeObjectSnapshot();
@@ skipping 1445 matching lines @@
   // beforeunload fired above, and detaching a DocumentLoader can fire events,
   // which can detach this frame.
   if (!m_frame->host())
     return;
 
   m_provisionalDocumentLoader = client()->createDocumentLoader(
       m_frame, resourceRequest,
       frameLoadRequest.substituteData().isValid()
           ? frameLoadRequest.substituteData()
           : defaultSubstituteDataForURL(resourceRequest.url()),
-      frameLoadRequest.clientRedirect());
+      frameLoadRequest.clientRedirect(), frameLoadRequest.originDocument());

[Mike West, 2016/11/23 11:11:20]

How will this eventually work in a oopif world?

[dcheng, 2016/11/23 14:41:44]

We'd still have a DocumentLoader in the original renderer. When we swap from
local to remote, content can read off the requestor URL then...

It's not great, but I can't really think of anything better =/

In my ideal world, content would just track this: whenever we initiate a
navigation, content/browser would take a note of the URL of the requestor frame
at the time. It'd require aggressively copying the (potentially) large URL
though. I'm a bit torn about what the best approach is atm... I think this would
be longer in the long run, but we'd want to figure out a way to defer the URL
copy until actual commit type.

(I'll talk to creis@ and nasko@ more about this today)

   m_provisionalDocumentLoader->setNavigationType(navigationType);
   m_provisionalDocumentLoader->setReplacesCurrentHistoryItem(
       type == FrameLoadTypeReplaceCurrentItem);
   m_frame->navigationScheduler().cancel();
   m_checkTimer.stop();
 
   m_loadType = type;
 
   if (frameLoadRequest.form())
     client()->dispatchWillSubmitForm(frameLoadRequest.form());
@@ skipping 249 matching lines @@
                          m_documentLoader ? m_documentLoader->url() : String());
   return tracedValue;
 }
 
 inline void FrameLoader::takeObjectSnapshot() const {
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("loading", "FrameLoader", this,
                                       toTracedValue());
 }
 
 }  // namespace blink