Set navigationStart correctly for all load types.

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 db7242bce67a9b0995cde3fe8a29c56a4d2fa453..a9a2409365fedc0d2726551d962312146e31f9cb 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -565,11 +565,8 @@ WebURLRequest CreateURLRequestForNavigation(
 // clamping it to renderer_navigation_start, initialized earlier in the call
 // stack.
 base::TimeTicks SanitizeNavigationTiming(
-    blink::WebFrameLoadType load_type,
     const base::TimeTicks& browser_navigation_start,
     const base::TimeTicks& renderer_navigation_start) {
-  if (load_type != blink::WebFrameLoadType::Standard)
-    return base::TimeTicks();
   DCHECK(!browser_navigation_start.is_null());
   base::TimeTicks navigation_start =
       std::min(browser_navigation_start, renderer_navigation_start);
@@ -5040,14 +5037,21 @@ WebNavigationPolicy RenderFrameImpl::decidePolicyForNavigation(
     return blink::WebNavigationPolicyIgnore;
   }
 
-  // Execute the BeforeUnload event. If asked not to proceed or the frame is
-  // destroyed, ignore the navigation. There is no need to execute the
-  // BeforeUnload event during a redirect, since it was already executed at the
-  // start of the navigation.
-  // PlzNavigate: this is not executed when commiting the navigation.
-  if (info.defaultPolicy == blink::WebNavigationPolicyCurrentTab &&
-      !is_redirect && (!IsBrowserSideNavigationEnabled() ||
-                       info.urlRequest.checkForBrowserSideNavigation())) {
+  bool should_dispatch_before_unload =
+      info.defaultPolicy == blink::WebNavigationPolicyCurrentTab &&
+      // There is no need to execute the BeforeUnload event during a redirect,
+      // since it was already executed at the start of the navigation.
+      !is_redirect &&
+      // PlzNavigate: this should not be executed when commiting the navigation.
+      (!IsBrowserSideNavigationEnabled() ||
+       info.urlRequest.checkForBrowserSideNavigation()) &&
+      // No need to dispatch beforeunload if the frame has not committed a
+      // navigation and contains an empty initial document.
+      (frame_->hasAccessedInitialDocument() || !current_history_item_.isNull());
+
+  if (should_dispatch_before_unload) {
+    // Execute the BeforeUnload event. If asked not to proceed or the frame is
+    // destroyed, ignore the navigation.
     // Keep a WeakPtr to this RenderFrameHost to detect if executing the
     // BeforeUnload event destriyed this frame.
     base::WeakPtr<RenderFrameImpl> weak_self = weak_factory_.GetWeakPtr();
@@ -5057,6 +5061,13 @@ WebNavigationPolicy RenderFrameImpl::decidePolicyForNavigation(
         !weak_self) {
       return blink::WebNavigationPolicyIgnore;
     }
+
+    // |navigation_start| must be recorded immediately after dispatching the
+    // beforeunload event.
+    if (pending_navigation_params_) {
+      pending_navigation_params_->common_params.navigation_start =
+          base::TimeTicks::Now();
+    }
   }
 
   // PlzNavigate: if the navigation is not synchronous, send it to the browser.
@@ -5454,13 +5465,11 @@ void RenderFrameImpl::NavigateInternal(
   pending_navigation_params_.reset(
       new NavigationParams(common_params, start_params, request_params));
 
-  // Unless the load is a WebFrameLoadType::Standard, this should remain
-  // uninitialized. It will be updated when the load type is determined to be
-  // Standard, or after the previous document's unload handler has been
-  // triggered. This occurs in UpdateNavigationState.
-  // TODO(csharrison) See if we can always use the browser timestamp.
+  // Sanitize navigation start and store in |pending_navigation_params_|.
+  // It will be picked up in UpdateNavigationState.
   pending_navigation_params_->common_params.navigation_start =
-      base::TimeTicks();
+      SanitizeNavigationTiming(common_params.navigation_start,
+                               renderer_navigation_start);
 
   // Create parameters for a standard navigation, indicating whether it should
   // replace the current NavigationEntry.
@@ -5583,11 +5592,6 @@ void RenderFrameImpl::NavigateInternal(
   }
 
   if (should_load_request) {
-    // Sanitize navigation start now that we know the load_type.
-    pending_navigation_params_->common_params.navigation_start =
-        SanitizeNavigationTiming(load_type, common_params.navigation_start,
-                                 renderer_navigation_start);
-
     // PlzNavigate: check if the navigation being committed originated as a
     // client redirect.
     bool is_client_redirect =
@@ -6027,12 +6031,7 @@ void RenderFrameImpl::UpdateNavigationState(DocumentState* document_state,
     return;
   }
 
-  // If this is a browser-initiated load that doesn't override
-  // navigation_start, set it here.
-  if (pending_navigation_params_->common_params.navigation_start.is_null()) {
-    pending_navigation_params_->common_params.navigation_start =
-        base::TimeTicks::Now();
-  }
+  DCHECK(!pending_navigation_params_->common_params.navigation_start.is_null());
   document_state->set_navigation_state(CreateNavigationStateFromPending());
 
   // The |set_was_load_data_with_base_url_request| state should not change for