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 40 matching lines @@
       process_(site_instance->GetProcess()),
       frame_tree_node_(frame_tree_node),
       render_frame_proxy_created_(false),
       render_view_host_(render_view_host) {
   GetProcess()->AddRoute(routing_id_, this);
   CHECK(g_routing_id_frame_proxy_map.Get().insert(
       std::make_pair(
           RenderFrameProxyHostID(GetProcess()->GetID(), routing_id_),
           this)).second);
   CHECK(render_view_host_);
-  frame_tree_node_->frame_tree()->AddRenderViewHostRef(render_view_host_);
+  // TODO(lazyboy): Comment why we skip this.
+  if (!frame_tree_node_->render_manager()->ForInnerDelegate())
+    frame_tree_node_->frame_tree()->AddRenderViewHostRef(render_view_host_);
 
-  if (!frame_tree_node_->IsMainFrame() &&
-      frame_tree_node_->parent()
-              ->render_manager()
-              ->current_frame_host()
-              ->GetSiteInstance() == site_instance) {
+  bool is_proxy_to_parent = !frame_tree_node_->IsMainFrame() &&
+                            frame_tree_node_->parent()
+                                    ->render_manager()
+                                    ->current_frame_host()
+                                    ->GetSiteInstance() == site_instance;
+
+  // If this is a proxy to parent frame or this proxy is for the inner
+  // WebContents's FrameTreeNode in outer WebContents's process, then we need a
+  // CrossProcessFrameConnector.
+  if (is_proxy_to_parent ||
+      frame_tree_node_->render_manager()->ForInnerDelegate()) {
     // 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));
   }
 }
 
 RenderFrameProxyHost::~RenderFrameProxyHost() {
   if (GetProcess()->HasConnection()) {
     // TODO(nasko): For now, don't send this IPC for top-level frames, as
     // the top-level RenderFrame will delete the RenderFrameProxy.
     // This can be removed once we don't have a swapped out state on
     // RenderFrame. See https://crbug.com/357747
     if (!frame_tree_node_->IsMainFrame())
       Send(new FrameMsg_DeleteProxy(routing_id_));
   }
 
-  frame_tree_node_->frame_tree()->ReleaseRenderViewHostRef(render_view_host_);
+  // TODO(lazyboy): Comment why we skip this.
+  if (!frame_tree_node_->render_manager()->ForInnerDelegate())
+    frame_tree_node_->frame_tree()->ReleaseRenderViewHostRef(render_view_host_);
   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));
 }
 
@@ skipping 78 matching lines @@
 
   render_frame_proxy_created_ = true;
   return true;
 }
 
 void RenderFrameProxyHost::DisownOpener() {
   Send(new FrameMsg_DisownOpener(GetRoutingID()));
 }
 
 void RenderFrameProxyHost::OnDetach() {
+  if (frame_tree_node_->render_manager()->ForInnerDelegate()) {
+    frame_tree_node_->render_manager()->RemoveOuterDelegateFrame();
+    return;
+  }
+
   // This message should only be received for subframes.  Note that we can't
   // restrict it to just the current SiteInstances of the ancestors of this
   // frame, because another frame in the tree may be able to detach this frame
   // by navigating its parent.
   if (frame_tree_node_->IsMainFrame()) {
     bad_message::ReceivedBadMessage(GetProcess(), bad_message::RFPH_DETACH);
     return;
   }
   frame_tree_node_->frame_tree()->RemoveFrame(frame_tree_node_);
 }
@@ skipping 80 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