[DRAFT] Create RenderFrameHostManager.

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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_host_impl.h"
 
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "content/browser/frame_host/frame_tree.h"
+#include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/common/frame_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // The (process id, routing id) pair that identifies one RenderFrame.
 typedef std::pair<int32, int32> RenderFrameHostID;
 typedef base::hash_map<RenderFrameHostID, RenderFrameHostImpl*>
     RoutingIDFrameMap;
 static base::LazyInstance<RoutingIDFrameMap> g_routing_id_frame_map =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 RenderFrameHostImpl* RenderFrameHostImpl::FromID(
     int process_id, int routing_id) {
   RoutingIDFrameMap* frames = g_routing_id_frame_map.Pointer();
   RoutingIDFrameMap::iterator it = frames->find(
       RenderFrameHostID(process_id, routing_id));
   return it == frames->end() ? NULL : it->second;
 }
 
 RenderFrameHostImpl::RenderFrameHostImpl(
     RenderViewHostImpl* render_view_host,
     FrameTree* frame_tree,
+    FrameTreeNode* frame_tree_node,
     int routing_id,
     bool is_swapped_out)
     : render_view_host_(render_view_host),
       frame_tree_(frame_tree),
+      frame_tree_node_(frame_tree_node),
       routing_id_(routing_id),
       is_swapped_out_(is_swapped_out) {
+  LOG(INFO) << "NEW RenderFrameHostImpl: process " << GetProcess()->GetID() <<
+      ", route " << routing_id_ << ", SID " <<
+      render_view_host_->GetSiteInstance()->GetId();
+  render_view_host_->RegisterRenderFrameHost(this);
   GetProcess()->AddRoute(routing_id_, this);
   g_routing_id_frame_map.Get().insert(std::make_pair(
       RenderFrameHostID(GetProcess()->GetID(), routing_id_),
       this));
 }
 
 RenderFrameHostImpl::~RenderFrameHostImpl() {
+  LOG(INFO) << "DELETE RenderFrameHostImpl: process " <<
+      GetProcess()->GetID() << ", route " << routing_id_ << ", SID " <<
+      render_view_host_->GetSiteInstance()->GetId();
+
   GetProcess()->RemoveRoute(routing_id_);
   g_routing_id_frame_map.Get().erase(
       RenderFrameHostID(GetProcess()->GetID(), routing_id_));
 
+  // Decrement the refcount of the frame's RenderViewHost, allowing it to shut
+  // down if it is no longer needed.
+  render_view_host_->UnregisterRenderFrameHost(this);
+}
+
+bool RenderFrameHostImpl::is_main_frame() const {
+  return frame_tree_node_ == frame_tree_->root();
 }
 
 bool RenderFrameHostImpl::Send(IPC::Message* message) {
   return GetProcess()->Send(message);
 }
 
 bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
   bool handled = true;
   bool msg_is_ok = true;
   IPC_BEGIN_MESSAGE_MAP_EX(RenderFrameHostImpl, msg, msg_is_ok)
     IPC_MESSAGE_HANDLER(FrameHostMsg_Detach, OnDetach)
     IPC_MESSAGE_HANDLER(FrameHostMsg_DidStartProvisionalLoadForFrame,
                         OnDidStartProvisionalLoadForFrame)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_SwapOut_ACK, OnSwapOutACK)
   IPC_END_MESSAGE_MAP_EX()
 
   return handled;
 }
 
 void RenderFrameHostImpl::Init() {
   GetProcess()->ResumeRequestsForView(routing_id());
 }
 
 RenderProcessHost* RenderFrameHostImpl::GetProcess() const {
   // TODO(nasko): This should return its own process, once we have working
   // cross-process navigation for subframes.
   return render_view_host_->GetProcess();
 }
 
 void RenderFrameHostImpl::OnCreateChildFrame(int new_frame_routing_id,
                                              int64 parent_frame_id,
                                              int64 frame_id,
                                              const std::string& frame_name) {
-  frame_tree_->AddFrame(new_frame_routing_id, parent_frame_id, frame_id,
-                        frame_name);
+  frame_tree_->AddFrame(render_view_host(), new_frame_routing_id,
+                        parent_frame_id, frame_id, frame_name);
 }
 
 void RenderFrameHostImpl::OnDetach(int64 parent_frame_id, int64 frame_id) {
-  frame_tree_->RemoveFrame(parent_frame_id, frame_id);
+  frame_tree_->RemoveFrame(
+      render_view_host()->GetFrameTreeNodeID(parent_frame_id),
+      render_view_host()->GetFrameTreeNodeID(frame_id));
 }
 
 void RenderFrameHostImpl::OnDidStartProvisionalLoadForFrame(
     int64 frame_id,
     int64 parent_frame_id,
     bool is_main_frame,
     const GURL& url) {
   render_view_host_->OnDidStartProvisionalLoadForFrame(
       frame_id, parent_frame_id, is_main_frame, url);
 }
 
+void RenderFrameHostImpl::SwapOut() {
+  if (render_view_host_->IsRenderViewLive()) {
+    Send(new FrameMsg_SwapOut(routing_id()));
+  } else {
+    // Our RenderViewHost doesn't have a live renderer, so just skip the unload
+    // event.
+    OnSwappedOut(true);
+  }
+}
+
+void RenderFrameHostImpl::OnSwapOutACK() {
+  OnSwappedOut(false);
+}
+
+void RenderFrameHostImpl::OnSwappedOut(bool timed_out) {
+  frame_tree_node_->render_manager()->SwappedOutFrame(this);
+}
+
 }  // namespace content