PlzNavigate: identify same-page browser-initiated navigation.

content/browser/frame_host/frame_tree_node.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/frame_tree_node.h"
 
 #include <queue>
 #include <utility>
 
 #include "base/lazy_instance.h"
@@ skipping 371 matching lines @@
 
   // There's no need to reset the state: there's still an ongoing load, and the
   // RenderFrameHostManager will take care of updates to the speculative
   // RenderFrameHost in DidCreateNavigationRequest below.
   if (was_previously_loading)
     ResetNavigationRequest(true);
 
   navigation_request_ = std::move(navigation_request);
   render_manager()->DidCreateNavigationRequest(navigation_request_.get());
 
-  // TODO(fdegans): Check if this is a same-document navigation and set the
-  // proper argument.
-  DidStartLoading(true, was_previously_loading);
+  bool to_different_document = !FrameMsg_Navigate_Type::IsSameDocument(
+      navigation_request_->common_params().navigation_type);
+
+  DidStartLoading(to_different_document, was_previously_loading);
 }
 
 void FrameTreeNode::ResetNavigationRequest(bool keep_state) {
   CHECK(IsBrowserSideNavigationEnabled());
   if (!navigation_request_)
     return;
   bool was_renderer_initiated = !navigation_request_->browser_initiated();
   NavigationRequest::AssociatedSiteInstanceType site_instance_type =
       navigation_request_->associated_site_instance_type();
   navigation_request_.reset();
@@ skipping 147 matching lines @@
       }
       return parent_->child_at(i + relative_offset);
     }
   }
 
   NOTREACHED() << "FrameTreeNode not found in its parent's children.";
   return nullptr;
 }
 
 }  // namespace content