NonValidatingReload: Monitor reload operations in NavigationControllerImpl

content/browser/frame_host/navigation_controller_impl.cc

Index: content/browser/frame_host/navigation_controller_impl.cc
diff --git a/content/browser/frame_host/navigation_controller_impl.cc b/content/browser/frame_host/navigation_controller_impl.cc
index c0ddb1b926e0af03b8758c235c8e8a4026164be5..011466ace48a9eec6b67e29b0eb2a4d73f5a259f 100644
--- a/content/browser/frame_host/navigation_controller_impl.cc
+++ b/content/browser/frame_host/navigation_controller_impl.cc
@@ -226,7 +226,8 @@ NavigationControllerImpl::NavigationControllerImpl(
       in_navigate_to_pending_entry_(false),
       pending_reload_(ReloadType::NONE),
       get_timestamp_callback_(base::Bind(&base::Time::Now)),
-      screenshot_manager_(new NavigationEntryScreenshotManager(this)) {
+      screenshot_manager_(new NavigationEntryScreenshotManager(this)),
+      last_committed_reload_type_(ReloadType::NONE) {
   DCHECK(browser_context_);
 }
 
@@ -329,6 +330,28 @@ void NavigationControllerImpl::ReloadInternal(bool check_for_repost,
   if (!entry)
     return;
 
+  // Check if previous navigation was a reload to track consecutive reload
+  // operations.
+  if (last_committed_reload_type_ != ReloadType::NONE) {
+    DCHECK(!last_committed_reload_time_.is_null());
+    base::Time now =
+        time_smoother_.GetSmoothedTime(get_timestamp_callback_.Run());
+    DCHECK_GT(now, last_committed_reload_time_);
+    if (!last_committed_reload_time_.is_null() &&
+        now > last_committed_reload_time_) {
+      base::TimeDelta delta = now - last_committed_reload_time_;
+      UMA_HISTOGRAM_MEDIUM_TIMES("Navigation.Reload.ReloadToReloadDuration",
+                                 delta);
+      if (last_committed_reload_type_ == ReloadType::MAIN_RESOURCE) {
+        UMA_HISTOGRAM_MEDIUM_TIMES(
+            "Navigation.Reload.ReloadMainResourceToReloadDuration", delta);
+      }
+    }
+  }
+
+  // Set ReloadType for |entry| in order to check it at commit time.
+  entry->set_reload_type(reload_type);
+
   if (g_check_for_repost && check_for_repost &&
       entry->GetHasPostData()) {
     // The user is asking to reload a page with POST data. Prompt to make sure
@@ -802,6 +825,20 @@ bool NavigationControllerImpl::RendererDidNavigate(
   details->is_in_page = IsURLInPageNavigation(params.url, params.origin,
                                               params.was_within_same_page, rfh);
 
+  // Save reload type and timestamp for a reload navigation to detect
+  // consecutive reloads when the next reload is requested.
+  if (PendingEntryMatchesHandle(rfh->navigation_handle())) {
+    if (pending_entry_->reload_type() != ReloadType::NONE) {
+      last_committed_reload_type_ = pending_entry_->reload_type();
+      last_committed_reload_time_ =
+          time_smoother_.GetSmoothedTime(get_timestamp_callback_.Run());
+    } else if (!pending_entry_->is_renderer_initiated() ||
+               params.gesture == NavigationGestureUser) {
+      last_committed_reload_type_ = ReloadType::NONE;
+      last_committed_reload_time_ = base::Time();
+    }
+  }
+
   switch (details->type) {
     case NAVIGATION_TYPE_NEW_PAGE:
       RendererDidNavigateToNewPage(rfh, params, details->is_in_page,