[DRAFT] Create RenderFrameHostManager.

content/browser/frame_host/frame_tree.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/frame_tree.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/renderer_host/render_view_host_factory.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
 
 namespace content {
 
 namespace {
 // Used with FrameTree::ForEach() to search for the FrameTreeNode
-// corresponding to |frame_id|.
-bool FrameTreeNodeForId(int64 frame_id, FrameTreeNode** out_node,
+// corresponding to |frame_tree_node_id|.
+bool FrameTreeNodeForId(int64 frame_tree_node_id,
+                        FrameTreeNode** out_node,
                         FrameTreeNode* node) {
-  if (node->frame_id() == frame_id) {
+  if (node->frame_tree_node_id() == frame_tree_node_id) {
     *out_node = node;
     // Terminate iteration once the node has been found.
     return false;
   }
   return true;
 }
 
 }  // namespace
 
-FrameTree::FrameTree()
-    : root_(new FrameTreeNode(FrameTreeNode::kInvalidFrameId, std::string(),
-                              scoped_ptr<RenderFrameHostImpl>())) {
+int64 FrameTree::next_frame_tree_node_id_ = 1;
+
+FrameTree::FrameTree(RenderViewHostDelegate* render_view_delegate,
+                     RenderWidgetHostDelegate* render_widget_delegate,
+                     RenderViewHostManager::Delegate* manager_delegate)
+    : render_view_delegate_(render_view_delegate),
+      render_widget_delegate_(render_widget_delegate),
+      manager_delegate_(manager_delegate),
+      root_(new FrameTreeNode(GetNextFrameTreeNodeID(), std::string(),
+                              render_view_delegate,
+                              render_widget_delegate,
+                              manager_delegate)) {
 }
 
 FrameTree::~FrameTree() {
 }
 
-FrameTreeNode* FrameTree::FindByID(int64 frame_id) {
+FrameTreeNode* FrameTree::FindByID(int64 frame_tree_node_id) {
   FrameTreeNode* node = NULL;
-  ForEach(base::Bind(&FrameTreeNodeForId, frame_id, &node));
+  ForEach(base::Bind(&FrameTreeNodeForId, frame_tree_node_id, &node));
   return node;
 }
 
 void FrameTree::ForEach(
     const base::Callback<bool(FrameTreeNode*)>& on_node) const {
   std::queue<FrameTreeNode*> queue;
   queue.push(root_.get());
 
   while (!queue.empty()) {
     FrameTreeNode* node = queue.front();
     queue.pop();
     if (!on_node.Run(node))
       break;
 
     for (size_t i = 0; i < node->child_count(); ++i)
       queue.push(node->child_at(i));
   }
 }
 
-bool FrameTree::IsFirstNavigationAfterSwap() const {
-  return root_->frame_id() == FrameTreeNode::kInvalidFrameId;
-}
-
-void FrameTree::OnFirstNavigationAfterSwap(int main_frame_id) {
-  root_->set_frame_id(main_frame_id);
-}
-
-void FrameTree::AddFrame(int render_frame_host_id, int64 parent_frame_id,
-                         int64 frame_id, const std::string& frame_name) {
-  FrameTreeNode* parent = FindByID(parent_frame_id);
+void FrameTree::AddFrame(RenderViewHostImpl* parent_render_view_host,
+                         int render_frame_host_id,
+                         int64 parent_frame_id,
+                         int64 frame_id,
+                         const std::string& frame_name) {
+  int64 parent_frame_tree_node_id =
+      parent_render_view_host->GetFrameTreeNodeID(parent_frame_id);
+  FrameTreeNode* parent = FindByID(parent_frame_tree_node_id);
   // TODO(ajwong): Should the renderer be killed here? Would there be a race on
   // shutdown that might make this case possible?
   if (!parent)
     return;
 
   parent->AddChild(CreateNode(frame_id, frame_name, render_frame_host_id,
-                              parent->render_frame_host()->GetProcess()));
+                              parent_render_view_host));
 }
 
-void FrameTree::RemoveFrame(int64 parent_frame_id, int64 frame_id) {
+void FrameTree::RemoveFrame(int64 parent_frame_tree_node_id,
+                            int64 frame_tree_node_id) {
   // If switches::kSitePerProcess is not specified, then the FrameTree only
   // contains a node for the root element. However, even in this case
   // frame detachments need to be broadcast outwards.
   //
   // TODO(ajwong): Move this below the |parent| check after the FrameTree is
   // guaranteed to be correctly populated even without the
   // switches::kSitePerProcess flag.
-  FrameTreeNode* parent = FindByID(parent_frame_id);
+  FrameTreeNode* parent = FindByID(parent_frame_tree_node_id);
   if (!on_frame_removed_.is_null()) {
     on_frame_removed_.Run(
-        root_->render_frame_host()->render_view_host(), frame_id);
+        root_->render_frame_host()->render_view_host(), frame_tree_node_id);
+  }
+
+  // Decrement the refcount of the frame's RenderViewHost, allowing it to shut
+  // down if it is no longer needed.
+  // TODO(creis): Is this the only way that RFHs can be deleted?  If not, we
+  // should listen for that instead of doing it here.
+  FrameTreeNode* node = FindByID(frame_tree_node_id);
+  RenderViewHostImpl* render_view_host =
+      node->render_frame_host()->render_view_host();
+  rvh_refcounts_[render_view_host->GetRoutingID()]--;
+  if (rvh_refcounts_[render_view_host->GetRoutingID()] <= 0) {
+    rvh_refcounts_.erase(render_view_host->GetRoutingID());
+    render_view_host->Shutdown();
   }
 
   // TODO(ajwong): Should the renderer be killed here? Would there be a race on
   // shutdown that might make this case possible?
   if (!parent)
     return;
 
-  parent->RemoveChild(frame_id);
+  parent->RemoveChild(frame_tree_node_id);
 }
 
-void FrameTree::SetFrameUrl(int64 frame_id, const GURL& url) {
-  FrameTreeNode* node = FindByID(frame_id);
+void FrameTree::SetFrameUrl(int64 frame_tree_node_id, const GURL& url) {
+  FrameTreeNode* node = FindByID(frame_tree_node_id);
   // TODO(ajwong): Should the renderer be killed here? Would there be a race on
   // shutdown that might make this case possible?
   if (!node)
     return;
 
   if (node)
     node->set_current_url(url);
 }
 
-void FrameTree::SwapMainFrame(RenderFrameHostImpl* render_frame_host) {
-  return root_->ResetForMainFrame(render_frame_host);
-}
-
 RenderFrameHostImpl* FrameTree::GetMainFrame() const {
   return root_->render_frame_host();
 }
 
 void FrameTree::SetFrameRemoveListener(
     const base::Callback<void(RenderViewHostImpl*, int64)>& on_frame_removed) {
   on_frame_removed_ = on_frame_removed;
 }
 
+RenderViewHostImpl* FrameTree::GetRenderViewHostForNewFrame(
+    SiteInstance* site_instance,
+    int routing_id,
+    int main_frame_routing_id,
+    bool swapped_out,
+    bool hidden) {
+  RenderViewHostMap::iterator iter =
+      render_view_host_map_.find(site_instance->GetId());
+  RenderViewHostImpl* rvh = NULL;
+  if (iter != render_view_host_map_.end()) {
+    rvh = iter->second;
+  } else {
+    rvh = static_cast<RenderViewHostImpl*>(
+        RenderViewHostFactory::Create(site_instance,
+                                      render_view_delegate_,
+                                      render_widget_delegate_,
+                                      routing_id,
+                                      main_frame_routing_id,
+                                      swapped_out,
+                                      hidden));
+
+    render_view_host_map_[site_instance->GetId()] = rvh;
+  }
+  rvh_refcounts_[rvh->GetRoutingID()]++;
+  return rvh;
+}
+
 scoped_ptr<FrameTreeNode> FrameTree::CreateNode(
-    int64 frame_id, const std::string& frame_name, int render_frame_host_id,
-    RenderProcessHost* render_process_host) {
-  scoped_ptr<RenderFrameHostImpl> render_frame_host(
-      new RenderFrameHostImpl(root_->render_frame_host()->render_view_host(),
-                              this, render_frame_host_id, false));
+    int64 frame_id,
+    const std::string& frame_name,
+    int render_frame_host_id,
+    RenderViewHostImpl* render_view_host) {
+  // TODO(creis): Call Init on the RFHM.
 
-  return make_scoped_ptr(new FrameTreeNode(frame_id, frame_name,
-                                           render_frame_host.Pass()));
+  // Create the FrameTreeNode with a unique browser-wide ID, and make sure the
+  // renderer-specific frame_id can be used to find it.
+  int64 frame_tree_node_id = GetNextFrameTreeNodeID();
+  render_view_host->RegisterFrameTreeNodeID(frame_id, frame_tree_node_id);
+  return make_scoped_ptr(new FrameTreeNode(frame_tree_node_id, frame_name,
+                                           render_view_delegate_,
+                                           render_widget_delegate_,
+                                           manager_delegate_));
+}
+
+int64 FrameTree::GetNextFrameTreeNodeID() {
+  return next_frame_tree_node_id_++;
 }
 
 }  // namespace content