Send a subtree of same-process PageStates for back/forward child frames.

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 695 matching lines @@
     const {
   return StartNavigationParams(extra_headers(),
                                transferred_global_request_id().child_id,
                                transferred_global_request_id().request_id);
 }
 
 RequestNavigationParams NavigationEntryImpl::ConstructRequestNavigationParams(
     const FrameNavigationEntry& frame_entry,
     bool is_same_document_history_load,
     bool is_history_navigation_in_new_child,
-    const std::map<std::string, bool>& subframe_unique_names,
+    const std::map<std::string, PageState>& subtree_page_states,
     bool has_committed_real_load,
     bool intended_as_new_entry,
     int pending_history_list_offset,
     int current_history_list_offset,
     int current_history_list_length) const {
   // Set the redirect chain to the navigation's redirects, unless returning to a
   // completed navigation (whose previous redirects don't apply).
   std::vector<GURL> redirects;
   if (ui::PageTransitionIsNewNavigation(GetTransitionType())) {
     redirects = frame_entry.redirect_chain();
   }
 
   int pending_offset_to_send = pending_history_list_offset;
   int current_offset_to_send = current_history_list_offset;
   int current_length_to_send = current_history_list_length;
   if (should_clear_history_list()) {
     // Set the history list related parameters to the same values a
     // NavigationController would return before its first navigation. This will
     // fully clear the RenderView's view of the session history.
     pending_offset_to_send = -1;
     current_offset_to_send = -1;
     current_length_to_send = 0;
   }
 
   RequestNavigationParams request_params(
       GetIsOverridingUserAgent(), redirects, GetCanLoadLocalResources(),
       frame_entry.page_state(), GetUniqueID(), is_same_document_history_load,
-      is_history_navigation_in_new_child, subframe_unique_names,
+      is_history_navigation_in_new_child, subtree_page_states,
       has_committed_real_load, intended_as_new_entry, pending_offset_to_send,
       current_offset_to_send, current_length_to_send, IsViewSourceMode(),
       should_clear_history_list());
 #if defined(OS_ANDROID)
   if (GetDataURLAsString() &&
       GetDataURLAsString()->size() <= kMaxLengthOfDataURLString) {
     // The number of characters that is enough for validating a data: URI.  From
     // the GURL's POV, the only important part here is scheme, it doesn't check
     // the actual content. Thus we can take only the prefix of the url, to avoid
     // unneeded copying of a potentially long string.
@@ skipping 102 matching lines @@
   parent_node->children.push_back(
       new NavigationEntryImpl::TreeNode(parent_node, 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;
 }
 
-std::map<std::string, bool> NavigationEntryImpl::GetSubframeUniqueNames(
+std::map<std::string, PageState> NavigationEntryImpl::GetSubtreePageStates(
     FrameTreeNode* frame_tree_node) const {
-  std::map<std::string, bool> names;
+  std::map<std::string, PageState> states;
   NavigationEntryImpl::TreeNode* tree_node = FindFrameEntry(frame_tree_node);
   if (tree_node) {
-    // Return the names of all immediate children.
-    for (TreeNode* child : tree_node->children) {
-      // Keep track of whether we would be loading about:blank, since the
-      // renderer should be allowed to just commit the initial blank frame if
-      // that was the default URL.  PageState doesn't matter there, because
-      // content injected into about:blank frames doesn't use it.
-      //
-      // Be careful not to rely on FrameNavigationEntry's URLs in this check,
-      // because the committed URL in the browser could be rewritten to
-      // about:blank.
-      // See RenderProcessHostImpl::FilterURL to know which URLs are rewritten.
-      // See https://crbug.com/657896 for details.
-      bool is_about_blank = false;
-      ExplodedPageState exploded_page_state;
-      if (DecodePageState(child->frame_entry->page_state().ToEncodedData(),
-                          &exploded_page_state)) {
-        ExplodedFrameState frame_state = exploded_page_state.top;
-        if (UTF16ToUTF8(frame_state.url_string.string()) == url::kAboutBlankURL)
-          is_about_blank = true;
-      }
+    // Return a map of unique name to (same-process) PageStates for the subtree
+    // rooted at |tree_node|.  Use an empty PageState for any cross-process
+    // PageStates, to indicate to the renderer that it should ask the browser
+    // process to handle the navigation.
+    SiteInstance* site_instance = tree_node->frame_entry->site_instance();
 
-      names[child->frame_entry->frame_unique_name()] = is_about_blank;
+    // Start with the immediate children.
+    std::queue<NavigationEntryImpl::TreeNode*> work_queue;
+    for (TreeNode* child : tree_node->children)
+      work_queue.push(child);
+    NavigationEntryImpl::TreeNode* node = nullptr;
+    while (!work_queue.empty()) {
+      node = work_queue.front();
+      work_queue.pop();
+
+      // Use an empty PageState if the FNE has a different SiteInstance.
+      states[node->frame_entry->frame_unique_name()] =
+          node->frame_entry->site_instance() == site_instance
+              ? node->frame_entry->page_state()
+              : PageState();
+
+      // Enqueue any further children and continue.
+      for (TreeNode* child : node->children)
+        work_queue.push(child);
     }
   }
-  return names;
+  return states;
 }
 
 void NavigationEntryImpl::ClearStaleFrameEntriesForNewFrame(
     FrameTreeNode* frame_tree_node) {
   DCHECK(!frame_tree_node->IsMainFrame());
 
   NavigationEntryImpl::TreeNode* node = nullptr;
   std::queue<NavigationEntryImpl::TreeNode*> work_queue;
   int count = 0;
 
@@ skipping 49 matching lines @@
       return node;
 
     // Enqueue any children and keep looking.
     for (auto* child : node->children)
       work_queue.push(child);
   }
   return nullptr;
 }
 
 }  // namespace content