PlzNavigate: identify same-page browser-initiated navigation.

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index 09d7ed98c8fd17451c99e81d4af0b1bcba6a6be1..63fa8111c1a2ffef5a4e8d6ff64522322d676386 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -46,6 +46,7 @@
 #include "content/public/common/content_constants.h"
 #include "content/public/common/resource_response.h"
 #include "net/base/net_errors.h"
+#include "net/base/url_util.h"
 #include "url/gurl.h"
 
 namespace content {
@@ -402,6 +403,12 @@ bool NavigatorImpl::NavigateToEntry(
     if (is_pending_entry && controller_->GetPendingEntryIndex() != -1)
       DCHECK(frame_entry.page_state().IsValid());
 
+    bool is_history_navigation = frame_entry.page_state().IsValid();
+    bool is_same_document_fragment_change =
+        net::IsFragmentAddedOrUpdated(frame_tree_node->current_url(),
+                                      dest_url) &&
+        !is_history_navigation;
+
     // Navigate in the desired RenderFrameHost.
     // We can skip this step in the rare case that this is a transfer navigation
     // which began in the chosen RenderFrameHost, since the request has already
@@ -422,8 +429,8 @@ bool NavigatorImpl::NavigateToEntry(
               previews_state, navigation_start),
           entry.ConstructStartNavigationParams(),
           entry.ConstructRequestNavigationParams(
-              frame_entry, is_same_document_history_load,
-              is_history_navigation_in_new_child,
+              frame_entry, is_same_document_fragment_change,
+              is_same_document_history_load, is_history_navigation_in_new_child,
               entry.GetSubframeUniqueNames(frame_tree_node),
               frame_tree_node->has_committed_real_load(),
               controller_->GetPendingEntryIndex() == -1,