Make <webview> use out-of-process iframe architecture.

content/browser/frame_host/render_frame_proxy_host.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/render_frame_proxy_host.h"
 
 #include "base/lazy_instance.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 38 matching lines @@
       site_instance_(site_instance),
       process_(site_instance->GetProcess()),
       frame_tree_node_(frame_tree_node),
       render_frame_proxy_created_(false) {
   GetProcess()->AddRoute(routing_id_, this);
   CHECK(g_routing_id_frame_proxy_map.Get().insert(
       std::make_pair(
           RenderFrameProxyHostID(GetProcess()->GetID(), routing_id_),
           this)).second);
 
-  if (!frame_tree_node_->IsMainFrame() &&
-      frame_tree_node_->parent()
-              ->render_manager()
-              ->current_frame_host()
-              ->GetSiteInstance() == site_instance) {
+  if ((!frame_tree_node_->IsMainFrame() &&
+       frame_tree_node_->parent()
+               ->render_manager()
+               ->current_frame_host()
+               ->GetSiteInstance() == site_instance) ||
+      // If this is a proxy for the guest FTN in its embedder process, then we
+      // need a CrossProcessFrameConnector.

[Charlie Reis, 2015/05/19 07:12:31]

This is getting a bit too complicated, given that there's comments within the
conditional itself.  Maybe we should split out the first half into a
is_proxy_to_parent bool and then move the comment before the conditional.

[lazyboy, 2015/05/21 23:23:47]

Done.

+      frame_tree_node_->render_manager()->IsGuest()) {
     // The RenderFrameHost navigating cross-process is destroyed and a proxy for
     // it is created in the parent's process. CrossProcessFrameConnector
     // initialization only needs to happen on an initial cross-process
     // navigation, when the RenderFrameHost leaves the same process as its
     // parent. The same CrossProcessFrameConnector is used for subsequent cross-
     // process navigations, but it will be destroyed if the frame is
     // navigated back to the same SiteInstance as its parent.
     cross_process_frame_connector_.reset(new CrossProcessFrameConnector(this));
   }
 }
@@ skipping 11 matching lines @@
   GetProcess()->RemoveRoute(routing_id_);
   g_routing_id_frame_proxy_map.Get().erase(
       RenderFrameProxyHostID(GetProcess()->GetID(), routing_id_));
 }
 
 void RenderFrameProxyHost::SetChildRWHView(RenderWidgetHostView* view) {
   cross_process_frame_connector_->set_view(
       static_cast<RenderWidgetHostViewChildFrame*>(view));
 }
 
+// TODO(lazyboy): We can probably cache a pointer to RVH in this class
+// as we do in RenderFrameHostImpl.
 RenderViewHostImpl* RenderFrameProxyHost::GetRenderViewHost() {
-  return frame_tree_node_->frame_tree()->GetRenderViewHost(
-      site_instance_.get());
+  // RVH of embedder SiteInstance does not live in the guest RFHM, we need to
+  // look it up in the embedder's FrameTree.
+  RenderFrameProxyHost* proxy_to_embedder =
+      frame_tree_node_->render_manager()->GetProxyToEmbedder();
+  FrameTree* frame_tree =
+      proxy_to_embedder &&
+              proxy_to_embedder->GetSiteInstance() == GetSiteInstance()
+          ? proxy_to_embedder->frame_tree_node_->frame_tree()
+          : frame_tree_node_->frame_tree();
+  return frame_tree->GetRenderViewHost(site_instance_.get());
 }
 
 void RenderFrameProxyHost::TakeFrameHostOwnership(
     scoped_ptr<RenderFrameHostImpl> render_frame_host) {
   CHECK(render_frame_host_ == nullptr);
   render_frame_host_ = render_frame_host.Pass();
   render_frame_host_->set_render_frame_proxy_host(this);
 }
 
 scoped_ptr<RenderFrameHostImpl> RenderFrameProxyHost::PassFrameHostOwnership() {
@@ skipping 160 matching lines @@
         base::Bind(&MessagePortMessageFilter::RouteMessageEventWithMessagePorts,
                    message_port_message_filter, target_rfh->GetRoutingID(),
                    new_params));
   } else {
     target_rfh->Send(
         new FrameMsg_PostMessageEvent(target_rfh->GetRoutingID(), new_params));
   }
 }
 
 }  // namespace content