Reland of Refactor the loading tracking logic in WebContentsImpl.

content/browser/frame_host/frame_tree_node.cc

Index: content/browser/frame_host/frame_tree_node.cc
diff --git a/content/browser/frame_host/frame_tree_node.cc b/content/browser/frame_host/frame_tree_node.cc
index 80035481e39ec266930ea396077d05cdde8ec49d..709cc26487b4005cded07a2632027f02848ff3a7 100644
--- a/content/browser/frame_host/frame_tree_node.cc
+++ b/content/browser/frame_host/frame_tree_node.cc
@@ -35,8 +35,7 @@ FrameTreeNode::FrameTreeNode(FrameTree* frame_tree,
       frame_tree_node_id_(next_frame_tree_node_id_++),
       parent_(NULL),
       replication_state_(name),
-      effective_sandbox_flags_(SandboxFlags::NONE),
-      is_loading_(false) {
+      effective_sandbox_flags_(SandboxFlags::NONE) {
 }
 
 FrameTreeNode::~FrameTreeNode() {
@@ -116,6 +115,28 @@ bool FrameTreeNode::IsDescendantOf(FrameTreeNode* other) const {
   return false;
 }
 
+bool FrameTreeNode::IsLoading() const {
+  RenderFrameHostImpl* current_frame_host =
+      render_manager_.current_frame_host();
+  RenderFrameHostImpl* pending_frame_host =
+      render_manager_.pending_frame_host();
+
+  DCHECK(current_frame_host);
+  // TODO(fdegans): Change the implementation logic for PlzNavigate once
+  // DidStartLoading and DidStopLoading are properly called.
+  if (pending_frame_host && pending_frame_host->is_loading())
+    return true;
+  return current_frame_host->is_loading();
+}
+
+double FrameTreeNode::GetLoadingProgress() const {
+  RenderFrameHostImpl* current_frame_host =
+      render_manager_.current_frame_host();
+
+  DCHECK(current_frame_host);
+  return current_frame_host->loading_progress();
+}
+
 bool FrameTreeNode::CommitPendingSandboxFlags() {
   bool did_change_flags =
       effective_sandbox_flags_ != replication_state_.sandbox_flags;