PlzNavigate: identify same-page browser-initiated navigation.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 6f1da7b8174a383440ee931e9b8db56cc6a93204..38470e83ec65881324756e04d0baec8b029ff5ca 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -2612,6 +2612,8 @@ void RenderFrameHostImpl::CommitNavigation(
   DCHECK((response && body.get()) ||
          common_params.url.SchemeIs(url::kDataScheme) ||
          !ShouldMakeNetworkRequestForURL(common_params.url) ||
+         request_params.is_same_document_fragment_change ||
+         request_params.is_same_document_history_load ||
          IsRendererDebugURL(common_params.url));
   UpdatePermissionsForNavigation(common_params, request_params);
 
@@ -2634,8 +2636,11 @@ void RenderFrameHostImpl::CommitNavigation(
                                      request_params));
 
   // If a network request was made, update the LoFi state.
-  if (ShouldMakeNetworkRequestForURL(common_params.url))
+  if (ShouldMakeNetworkRequestForURL(common_params.url) &&
+      !request_params.is_same_document_fragment_change &&
+      !request_params.is_same_document_history_load) {
     last_navigation_lofi_state_ = common_params.lofi_state;
+  }
 
   // TODO(clamy): Release the stream handle once the renderer has finished
   // reading it.
@@ -3310,14 +3315,25 @@ void RenderFrameHostImpl::OnMediaInterfaceFactoryConnectionError() {
 std::unique_ptr<NavigationHandleImpl>
 RenderFrameHostImpl::TakeNavigationHandleForCommit(
     const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {
+  bool is_browser_initiated = (params.nav_entry_id != 0);
+
   // If this is a same-page navigation, there isn't an existing NavigationHandle
   // to use for the navigation. Create one, but don't reset any NavigationHandle
   // tracking an ongoing navigation, since this may lead to the cancellation of
   // the navigation.
+  // PlzNavigate: This doesn't apply for browser-initiated same-page navigation,
+  // because a NavigationHandle is created.
   if (params.was_within_same_page) {
+    if (IsBrowserSideNavigationEnabled() && is_browser_initiated &&
+        navigation_handle_ && navigation_handle_->IsSamePage() &&
+        navigation_handle_->GetURL() == params.url) {
+      return std::move(navigation_handle_);
+    }
+
     // We don't ever expect navigation_handle_ to match, because handles are not
     // created for same-page navigations.
-    DCHECK(!navigation_handle_ || !navigation_handle_->IsSamePage());
+    DCHECK(IsBrowserSideNavigationEnabled() || !navigation_handle_ ||
+           !navigation_handle_->IsSamePage());
 
     // First, determine if the navigation corresponds to the pending navigation
     // entry. This is the case for a browser-initiated same-page navigation,