Tracing for NavigationHandle lifetime and state.

content/browser/frame_host/data_url_navigation_throttle.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/data_url_navigation_throttle.h"
 
 #include "base/feature_list.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 26 matching lines @@
     return PROCEED;
 
   RenderFrameHost* top_frame =
       handle->frame_tree_node()->frame_tree()->root()->current_frame_host();
   top_frame->AddMessageToConsole(
       CONSOLE_MESSAGE_LEVEL_ERROR,
       base::StringPrintf(kConsoleError, handle->GetURL().spec().c_str()));
   return CANCEL;
 }
 
+const char* DataUrlNavigationThrottle::GetNameForLogging() {
+  return "DataUrlNavigationThrottle";
+}
+
 // static
 std::unique_ptr<NavigationThrottle>
 DataUrlNavigationThrottle::CreateThrottleForNavigation(
     NavigationHandle* navigation_handle) {
   if (navigation_handle->GetURL().SchemeIs(url::kDataScheme) &&
       navigation_handle->IsInMainFrame() &&
       navigation_handle->IsRendererInitiated() &&
       !navigation_handle->IsSameDocument() &&
       !base::FeatureList::IsEnabled(
           features::kAllowContentInitiatedDataUrlNavigations)) {
     return base::MakeUnique<DataUrlNavigationThrottle>(navigation_handle);
   }
   return nullptr;
 }
 
 }  // namespace content