OOPIF: Fix subframe back/forward after recreating FTNs (try #2).

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 21 matching lines @@
 // Use this to get a new unique ID for a NavigationEntry during construction.
 // The returned ID is guaranteed to be nonzero (which is the "no ID" indicator).
 int GetUniqueIDInConstructor() {
   static int unique_id_counter = 0;
   return ++unique_id_counter;
 }
 
 void RecursivelyGenerateFrameEntries(const ExplodedFrameState& state,
                                      NavigationEntryImpl::TreeNode* node) {
   node->frame_entry = new FrameNavigationEntry(
-      -1, UTF16ToUTF8(state.target.string()), state.item_sequence_number,
+      UTF16ToUTF8(state.target.string()), state.item_sequence_number,
       state.document_sequence_number, nullptr, GURL(state.url_string.string()),
       Referrer(GURL(state.referrer.string()), state.referrer_policy), "GET",
       -1);
 
   // Set a single-frame PageState on the entry.
   ExplodedPageState page_state;
   page_state.top = state;
   std::string data;
   if (EncodePageState(page_state, &data))
     node->frame_entry->set_page_state(PageState::CreateFromEncodedData(data));
@@ skipping 40 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) const {
-  if (frame_tree_node->frame_tree_node_id() ==
-      frame_entry->frame_tree_node_id())
-    return true;
+bool NavigationEntryImpl::TreeNode::MatchesFrame(FrameTreeNode* frame_tree_node,
+                                                 bool is_root_tree_node) const {
+  // The root node is for the main frame whether the unique name matches or not.
+  if (is_root_tree_node)
+    return frame_tree_node->IsMainFrame();
 
-  // For now, we set the root FNE's FrameTreeNode ID to -1.
-  return frame_tree_node->IsMainFrame() &&
-         frame_entry->frame_tree_node_id() == -1;
+  // Otherwise check the unique name for subframes.
+  return !frame_tree_node->IsMainFrame() &&
+         frame_tree_node->unique_name() == frame_entry->frame_unique_name();
 }
 
 std::unique_ptr<NavigationEntryImpl::TreeNode>
 NavigationEntryImpl::TreeNode::CloneAndReplace(
     FrameTreeNode* frame_tree_node,
-    FrameNavigationEntry* frame_navigation_entry) const {
-  if (frame_tree_node && MatchesFrame(frame_tree_node)) {
+    FrameNavigationEntry* frame_navigation_entry,
+    bool is_root_tree_node) const {
+  if (frame_tree_node && MatchesFrame(frame_tree_node, is_root_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()));
 
   // Recursively clone the children.
   for (auto& child : children) {
     copy->children.push_back(
-        child->CloneAndReplace(frame_tree_node, frame_navigation_entry));
+        child->CloneAndReplace(frame_tree_node, frame_navigation_entry, false));
   }
 
   return copy;
 }
 
 std::unique_ptr<NavigationEntry> NavigationEntry::Create() {
   return base::WrapUnique(new NavigationEntryImpl());
 }
 
 NavigationEntryImpl* NavigationEntryImpl::FromNavigationEntry(
@@ skipping 17 matching lines @@
 }
 
 NavigationEntryImpl::NavigationEntryImpl(
     scoped_refptr<SiteInstanceImpl> instance,
     int page_id,
     const GURL& url,
     const Referrer& referrer,
     const base::string16& title,
     ui::PageTransition transition_type,
     bool is_renderer_initiated)
-    : frame_tree_(new TreeNode(new FrameNavigationEntry(-1,
-                                                        "",
+    : frame_tree_(new TreeNode(new FrameNavigationEntry("",
                                                         -1,
                                                         -1,
                                                         std::move(instance),
                                                         url,
                                                         referrer,
                                                         "GET",
                                                         -1))),
       unique_id_(GetUniqueIDInConstructor()),
       bindings_(kInvalidBindings),
       page_type_(PAGE_TYPE_NORMAL),
@@ skipping 342 matching lines @@
 }
 
 std::unique_ptr<NavigationEntryImpl> NavigationEntryImpl::CloneAndReplace(
     FrameTreeNode* frame_tree_node,
     FrameNavigationEntry* frame_navigation_entry) const {
   std::unique_ptr<NavigationEntryImpl> copy =
       base::WrapUnique(new NavigationEntryImpl());
 
   // TODO(creis): Only share the same FrameNavigationEntries if cloning within
   // the same tab.
-  copy->frame_tree_ =
-      frame_tree_->CloneAndReplace(frame_tree_node, frame_navigation_entry);
+  copy->frame_tree_ = frame_tree_->CloneAndReplace(
+      frame_tree_node, frame_navigation_entry, true);
 
   // Copy most state over, unless cleared in ResetForCommit.
   // Don't copy unique_id_, otherwise it won't be unique.
   copy->bindings_ = bindings_;
   copy->page_type_ = page_type_;
   copy->virtual_url_ = virtual_url_;
   copy->update_virtual_url_with_url_ = update_virtual_url_with_url_;
   copy->title_ = title_;
   copy->favicon_ = favicon_;
   copy->page_id_ = page_id_;
@@ skipping 133 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,
     const std::string& method,
     int64_t post_id) {
   // 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->unique_name();
   for (TreeNode* child : parent_node->children) {
-    if (child->frame_entry->frame_tree_node_id() == frame_tree_node_id) {
+    if (child->frame_entry->frame_unique_name() == unique_name) {
       // Update the existing FrameNavigationEntry (e.g., for replaceState).
       child->frame_entry->UpdateEntry(
-          frame_unique_name, item_sequence_number, document_sequence_number,
+          unique_name, item_sequence_number, document_sequence_number,
           site_instance, url, referrer, page_state, method, post_id);
       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, frame_unique_name, item_sequence_number,
-      document_sequence_number, site_instance, url, referrer, method, post_id);
+      unique_name, item_sequence_number, document_sequence_number,
+      site_instance, url, referrer, method, post_id);
   frame_entry->set_page_state(page_state);
   parent_node->children.push_back(
       new NavigationEntryImpl::TreeNode(frame_entry));
 }
 
 FrameNavigationEntry* NavigationEntryImpl::GetFrameEntry(
     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) 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());
+    if (node->MatchesFrame(frame_tree_node, node == root_node()))
       return node;
-    }
+
     // Enqueue any children and keep looking.
     for (auto& child : node->children)
       work_queue.push(child);
   }
   return nullptr;
 }
 
 }  // namespace content