Add more navigation tracing to RenderFrameHost and NavigationRequest.

content/browser/frame_host/navigation_request.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
@@ skipping 117 matching lines @@
 
   bool is_view_source() const { return is_view_source_; };
 
   int bindings() const { return bindings_; };
 
   bool browser_initiated() const { return browser_initiated_ ; }
 
   bool may_transfer() const { return may_transfer_; }
 
   void SetWaitingForRendererResponse() {
+    TRACE_EVENT_ASYNC_STEP_INTO0("navigation", "NavigationRequest", this,
+                                 "WaitingForRendererResponse");
     DCHECK(state_ == NOT_STARTED);
     state_ = WAITING_FOR_RENDERER_RESPONSE;

[Charlie Reis, 2017/04/28 00:30:52]

Minor nit: This implementation probably belongs in the .cc file at this point,
with the extra code.  (It's already not hacker_style(), so it seems a bit odd to
have it inlined anyway.)

[nasko, 2017/04/28 14:01:53]

Done.

   }
 
   AssociatedSiteInstanceType associated_site_instance_type() const {
     return associated_site_instance_type_;
   }
   void set_associated_site_instance_type(AssociatedSiteInstanceType type) {
     associated_site_instance_type_ = type;
   }
 
   NavigationHandleImpl* navigation_handle() const {
@@ skipping 108 matching lines @@
   mojo::ScopedDataPipeConsumerHandle handle_;
 
   base::Closure on_start_checks_complete_closure_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_