Remove WebHistoryItem child usage

content/renderer/history_controller.cc

 // Copyright 2014 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.
 
 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  *     (http://www.torchmobile.com/)
  *
@@ skipping 17 matching lines @@
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "content/renderer/history_controller.h"
 
-#include <deque>
-
 #include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_view_impl.h"
-#include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 
 using blink::WebFrame;
 using blink::WebHistoryCommitType;
 using blink::WebHistoryItem;
 using blink::WebURLRequest;
-using blink::WebVector;
 
 namespace content {
 
 HistoryController::HistoryController(RenderViewImpl* render_view)
     : render_view_(render_view) {
 }
 
 HistoryController::~HistoryController() {
 }
 
 void HistoryController::GoToEntry(HistoryEntry* target_entry,
                                   WebURLRequest::CachePolicy cache_policy) {
   HistoryFrameLoadVector same_document_loads;
   HistoryFrameLoadVector different_document_loads;
 
   provisional_entry_.reset(target_entry);
 
   WebFrame* main_frame = render_view_->main_render_frame()->GetWebFrame();
   if (current_entry_) {
     RecursiveGoToEntry(
         main_frame, same_document_loads, different_document_loads);
-  } else {
-    different_document_loads.push_back(
-        std::make_pair(main_frame, provisional_entry_->root()));
   }
 
   if (same_document_loads.empty() && different_document_loads.empty()) {
-    same_document_loads.push_back(
+    // If we don't have any frames to navigate at this point, either
+    // (1) there is no previous history entry to compare against, or
+    // (2) we were unable to match any frames by name. In the first case,
+    // doing a different document navigation to the root item is the only valid
+    // thing to do. In the second case, we should have been able to find a
+    // frame to navigate based on names if this were a same document
+    // navigation, so we can safely assume this is the different document case.
+    different_document_loads.push_back(
         std::make_pair(main_frame, provisional_entry_->root()));
-  }
-
-  if (different_document_loads.empty()) {
+  } else if (different_document_loads.empty()) {
+    // If we have only same document navigations to perform, immediately
+    // declare the load "committed" by updating the current entry.
+    // TODO(japhet): This is a historical quirk, because same-document
+    // history navigations call UpdateForCommit() with commit type
+    // HistoryInertCommit. If that is fixed, we can remove this block.
     previous_entry_.reset(current_entry_.release());
     current_entry_.reset(provisional_entry_.release());
   }
 
   for (size_t i = 0; i < same_document_loads.size(); ++i) {
     WebFrame* frame = same_document_loads[i].first;
     if (!RenderFrameImpl::FromWebFrame(frame))
       continue;
     frame->loadHistoryItem(same_document_loads[i].second,
                            blink::WebHistorySameDocumentLoad,
@@ skipping 32 matching lines @@
       different_document_loads.push_back(std::make_pair(frame, new_item));
     return;
   }
 
   for (WebFrame* child = frame->firstChild(); child;
        child = child->nextSibling()) {
     RecursiveGoToEntry(child, same_document_loads, different_document_loads);
   }
 }
 
-void HistoryController::GoToItem(const WebHistoryItem& target_item,
-                                 WebURLRequest::CachePolicy cache_policy) {
-  // We don't have enough information to set a correct frame id here. This
-  // might be a restore from disk, and the frame ids might not match up if the
-  // state was saved from a different process. Ensure the HistoryEntry's main
-  // frame id matches the actual main frame id. Its subframe ids are invalid to
-  // ensure they don't accidentally match a potentially random frame.
-  HistoryEntry* new_entry = new HistoryEntry(
-      target_item, render_view_->main_render_frame()->GetRoutingID());
-  std::deque<HistoryEntry::HistoryNode*> history_nodes;
-  history_nodes.push_back(new_entry->root_history_node());
-  while (!history_nodes.empty()) {
-    // For each item, read the children (if any) off the WebHistoryItem,
-    // create a new HistoryNode for each child and attach it,
-    // then clear the children on the WebHistoryItem.
-    HistoryEntry::HistoryNode* history_node = history_nodes.front();
-    history_nodes.pop_front();
-
-    WebVector<WebHistoryItem> children = history_node->item().children();
-    for (size_t i = 0; i < children.size(); i++) {
-      HistoryEntry::HistoryNode* child_history_node =
-          history_node->AddChild(children[i], kInvalidFrameRoutingID);
-      history_nodes.push_back(child_history_node);
-    }
-    history_node->item().setChildren(WebVector<WebHistoryItem>());
-  }
-  GoToEntry(new_entry, cache_policy);
-}
-
 void HistoryController::UpdateForInitialLoadInChildFrame(
     RenderFrameImpl* frame,
     const WebHistoryItem& item) {
   DCHECK_NE(frame->GetWebFrame()->top(), frame->GetWebFrame());
   if (!current_entry_)
     return;
   if (HistoryEntry::HistoryNode* existing_node =
           current_entry_->GetHistoryNodeForFrame(frame)) {
     existing_node->set_item(item);
     return;
@@ skipping 15 matching lines @@
       return;
     previous_entry_.reset(current_entry_.release());
     current_entry_.reset(provisional_entry_.release());
   } else if (commit_type == blink::WebStandardCommit) {
     CreateNewBackForwardItem(frame, item, navigation_within_page);
   } else if (commit_type == blink::WebInitialCommitInChildFrame) {
     UpdateForInitialLoadInChildFrame(frame, item);
   }
 }
 
-static WebHistoryItem ItemForExport(HistoryEntry::HistoryNode* history_node) {
-  DCHECK(history_node);
-  WebHistoryItem item = history_node->item();
-  item.setChildren(WebVector<WebHistoryItem>());
-  std::vector<HistoryEntry::HistoryNode*>& child_nodes =
-      history_node->children();
-  for (size_t i = 0; i < child_nodes.size(); i++)
-    item.appendToChildren(ItemForExport(child_nodes.at(i)));
-  return item;
+HistoryEntry* HistoryController::GetCurrentEntry() {
+  return current_entry_.get();
 }
 
-WebHistoryItem HistoryController::GetCurrentItemForExport() {
-  if (!current_entry_)
-    return WebHistoryItem();
-  return ItemForExport(current_entry_->root_history_node());
-}
-
-WebHistoryItem HistoryController::GetPreviousItemForExport() {
-  if (!previous_entry_)
-    return WebHistoryItem();
-  return ItemForExport(previous_entry_->root_history_node());
+HistoryEntry* HistoryController::GetPreviousEntry() {
+  return previous_entry_.get();
 }
 
 WebHistoryItem HistoryController::GetItemForNewChildFrame(
     RenderFrameImpl* frame) const {
   if (!current_entry_)
     return WebHistoryItem();
   return current_entry_->GetItemForFrame(frame);
 }
 
 void HistoryController::RemoveChildrenForRedirect(RenderFrameImpl* frame) {
@@ skipping 12 matching lines @@
     current_entry_.reset(
         new HistoryEntry(new_item, target_frame->GetRoutingID()));
   } else {
     previous_entry_.reset(current_entry_.release());
     current_entry_.reset(previous_entry_->CloneAndReplace(
         new_item, clone_children_of_target, target_frame, render_view_));
   }
 }
 
 }  // namespace content