scheduler: Detect load RAIL mode

content/renderer/render_frame_impl.cc

 // Copyright 2013 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/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 1613 matching lines @@
   // clean this frame up after https://crbug.com/548275 is fixed.
   if (proxy_routing_id_ != MSG_ROUTING_NONE) {
     RenderFrameProxy* proxy =
         RenderFrameProxy::FromRoutingID(proxy_routing_id_);
     if (!proxy)
       return;
   }
 
   RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
   // Can be NULL in tests.
-  if (render_thread_impl)
+  if (render_thread_impl && IsMainFrame())
     render_thread_impl->GetRendererScheduler()->OnNavigationStarted();
   DCHECK(!IsBrowserSideNavigationEnabled());
   TRACE_EVENT2("navigation,rail", "RenderFrameImpl::OnNavigate", "id",
                routing_id_, "url", common_params.url.possibly_invalid_spec());
   NavigateInternal(common_params, start_params, request_params,
                    std::unique_ptr<StreamOverrideParameters>());
 }
 
 void RenderFrameImpl::Bind(mojom::FrameRequest request,
                            mojom::FrameHostPtr host) {
@@ skipping 4845 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content