Revert of OOPIF: Fix subframe back/forward after recreating FTNs.

content/browser/frame_host/navigation_entry_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/navigation_entry_impl.h"
 
 #include <stddef.h>
 
 #include <queue>
 #include <utility>
@@ skipping 82 matching lines @@
 int NavigationEntryImpl::kInvalidBindings = -1;
 
 NavigationEntryImpl::TreeNode::TreeNode(FrameNavigationEntry* frame_entry)
     : frame_entry(frame_entry) {
 }
 
 NavigationEntryImpl::TreeNode::~TreeNode() {
 }
 
 bool NavigationEntryImpl::TreeNode::MatchesFrame(
-    FrameTreeNode* frame_tree_node) {
+    FrameTreeNode* frame_tree_node) const {
   if (frame_tree_node->frame_tree_node_id() ==
       frame_entry->frame_tree_node_id())
     return true;
 
-  if (frame_tree_node->current_replication_state().unique_name ==
-      frame_entry->frame_unique_name()) {
-    // If we find a match by unique name but not FrameTreeNode ID, then the
-    // FrameTreeNode ID on the entry is stale and should be updated.
-    frame_entry->set_frame_tree_node_id(frame_tree_node->frame_tree_node_id());
-    return true;
-  }
-
   // For now, we set the root FNE's FrameTreeNode ID to -1.
   return frame_tree_node->IsMainFrame() &&
          frame_entry->frame_tree_node_id() == -1;
 }
 
 std::unique_ptr<NavigationEntryImpl::TreeNode>
 NavigationEntryImpl::TreeNode::CloneAndReplace(
     FrameTreeNode* frame_tree_node,
-    FrameNavigationEntry* frame_navigation_entry) {
+    FrameNavigationEntry* frame_navigation_entry) const {
   if (frame_tree_node && MatchesFrame(frame_tree_node)) {
     // Replace this node in the cloned tree and prune its children.
     return base::WrapUnique(
         new NavigationEntryImpl::TreeNode(frame_navigation_entry));
   }
 
   // Clone the tree using a copy of the FrameNavigationEntry, without sharing.
   // TODO(creis): Share FNEs unless it's for another tab.
   std::unique_ptr<NavigationEntryImpl::TreeNode> copy(
       new NavigationEntryImpl::TreeNode(frame_entry->Clone()));
@@ skipping 553 matching lines @@
 
 #if defined(OS_ANDROID)
   // Reset the time stamp so that the metrics are not reported if this entry is
   // loaded again in the future.
   set_intent_received_timestamp(base::TimeTicks());
 #endif
 }
 
 void NavigationEntryImpl::AddOrUpdateFrameEntry(
     FrameTreeNode* frame_tree_node,
+    const std::string& frame_unique_name,
     int64_t item_sequence_number,
     int64_t document_sequence_number,
     SiteInstanceImpl* site_instance,
     const GURL& url,
     const Referrer& referrer,
     const PageState& page_state) {
   // We should already have a TreeNode for the parent node by the time this node
   // commits.  Find it first.
   DCHECK(frame_tree_node->parent());
   NavigationEntryImpl::TreeNode* parent_node =
       FindFrameEntry(frame_tree_node->parent());
   if (!parent_node) {
     // The renderer should not send a commit for a subframe before its parent.
     // TODO(creis): Kill the renderer if we get here.
     return;
   }
 
   // Now check whether we have a TreeNode for the node itself.
   int frame_tree_node_id = frame_tree_node->frame_tree_node_id();
-  const std::string& unique_name =
-      frame_tree_node->current_replication_state().unique_name;
   for (TreeNode* child : parent_node->children) {
-    if (child->frame_entry->frame_tree_node_id() == frame_tree_node_id ||
-        child->frame_entry->frame_unique_name() == unique_name) {
+    if (child->frame_entry->frame_tree_node_id() == frame_tree_node_id) {
       // Update the existing FrameNavigationEntry (e.g., for replaceState).
-      child->frame_entry->UpdateEntry(unique_name, item_sequence_number,
+      child->frame_entry->UpdateEntry(frame_unique_name, item_sequence_number,
                                       document_sequence_number, site_instance,
                                       url, referrer, page_state);
       return;
     }
   }
 
   // No entry exists yet, so create a new one.
   // Unordered list, since we expect to look up entries by frame sequence number
   // or unique name.
   FrameNavigationEntry* frame_entry = new FrameNavigationEntry(
-      frame_tree_node_id, unique_name, item_sequence_number,
+      frame_tree_node_id, frame_unique_name, item_sequence_number,
       document_sequence_number, site_instance, url, referrer);
   frame_entry->set_page_state(page_state);
   parent_node->children.push_back(
       new NavigationEntryImpl::TreeNode(frame_entry));
 }
 
 FrameNavigationEntry* NavigationEntryImpl::GetFrameEntry(
-    FrameTreeNode* frame_tree_node) {
+    FrameTreeNode* frame_tree_node) const {
   NavigationEntryImpl::TreeNode* tree_node = FindFrameEntry(frame_tree_node);
   return tree_node ? tree_node->frame_entry.get() : nullptr;
 }
 
+FrameNavigationEntry* NavigationEntryImpl::GetFrameEntryByUniqueName(
+    const std::string& unique_name) const {
+  NavigationEntryImpl::TreeNode* node = nullptr;
+  std::queue<NavigationEntryImpl::TreeNode*> work_queue;
+  work_queue.push(root_node());
+  while (!work_queue.empty()) {
+    node = work_queue.front();
+    work_queue.pop();
+    if (node->frame_entry->frame_unique_name() == unique_name)
+      return node->frame_entry.get();
+
+    // Enqueue any children and keep looking.
+    for (auto& child : node->children)
+      work_queue.push(child);
+  }
+  return nullptr;
+}
+
 void NavigationEntryImpl::SetScreenshotPNGData(
     scoped_refptr<base::RefCountedBytes> png_data) {
   screenshot_ = png_data;
   if (screenshot_.get())
     UMA_HISTOGRAM_MEMORY_KB("Overscroll.ScreenshotSize", screenshot_->size());
 }
 
 GURL NavigationEntryImpl::GetHistoryURLForDataURL() const {
   return GetBaseURLForDataURL().is_empty() ? GURL() : GetVirtualURL();
 }
 
 NavigationEntryImpl::TreeNode* NavigationEntryImpl::FindFrameEntry(
-    FrameTreeNode* frame_tree_node) {
+    FrameTreeNode* frame_tree_node) const {
   NavigationEntryImpl::TreeNode* node = nullptr;
   std::queue<NavigationEntryImpl::TreeNode*> work_queue;
   work_queue.push(root_node());
   while (!work_queue.empty()) {
     node = work_queue.front();
     work_queue.pop();
     if (node->MatchesFrame(frame_tree_node)) {
       // Only the root TreeNode should have a FTN ID of -1.
       DCHECK(node->frame_entry->frame_tree_node_id() != -1 ||
              node == root_node());
       return node;
     }
     // Enqueue any children and keep looking.
     for (auto& child : node->children)
       work_queue.push(child);
   }
   return nullptr;
 }
 
 }  // namespace content