PlzNavigate: identify same-page browser-initiated navigation.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index be46fd8b8128c5eb43ff8e6d8c75d1861c037bce..081967f33e88970ebdfb72183eb06aa0e3a0e2b8 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -552,7 +552,8 @@ bool IsTopLevelNavigation(WebFrame* frame) {
 WebURLRequest CreateURLRequestForNavigation(
     const CommonNavigationParams& common_params,
     std::unique_ptr<StreamOverrideParameters> stream_override,
-    bool is_view_source_mode_enabled) {
+    bool is_view_source_mode_enabled,
+    bool is_same_document_navigation) {
   WebURLRequest request(common_params.url);
   if (is_view_source_mode_enabled)
     request.setCachePolicy(WebCachePolicy::ReturnCacheDataElseLoad);
@@ -570,6 +571,8 @@ WebURLRequest CreateURLRequestForNavigation(
     }
   }
 
+  request.setIsSameDocumentNavigation(is_same_document_navigation);
+
   request.setLoFiState(
       static_cast<WebURLRequest::LoFiState>(common_params.lofi_state));
 
@@ -5133,7 +5136,8 @@ void RenderFrameImpl::OnFailedNavigation(
       CreateWebURLError(common_params.url, has_stale_copy_in_cache, error_code);
   WebURLRequest failed_request = CreateURLRequestForNavigation(
       common_params, std::unique_ptr<StreamOverrideParameters>(),
-      frame_->isViewSourceModeEnabled());
+      frame_->isViewSourceModeEnabled(),
+      false); // is_same_document_navigation
 
   if (!ShouldDisplayErrorPageForFailedLoad(error_code, common_params.url)) {
     // The browser expects this frame to be loading an error page. Inform it
@@ -5819,9 +5823,14 @@ void RenderFrameImpl::NavigateInternal(
       blink::WebHistoryDifferentDocumentLoad;
   bool should_load_request = false;
   WebHistoryItem item_for_history_navigation;
-  WebURLRequest request =
-      CreateURLRequestForNavigation(common_params, std::move(stream_params),
-                                    frame_->isViewSourceModeEnabled());
+
+  bool is_same_page = request_params.is_same_document_fragment_change ||
+                      request_params.is_same_document_history_load;
+
+  WebURLRequest request = CreateURLRequestForNavigation(
+      common_params, std::move(stream_params),
+      frame_->isViewSourceModeEnabled(),
+      is_same_page);
   request.setFrameType(IsTopLevelNavigation(frame_)
                            ? blink::WebURLRequest::FrameTypeTopLevel
                            : blink::WebURLRequest::FrameTypeNested);