Add RAIL tracing category to Chrome tracing.

content/browser/frame_host/navigator_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/browser/frame_host/navigator_impl.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 295 matching lines @@
                  << " characters.";
     return false;
   }
 
   // This will be used to set the Navigation Timing API navigationStart
   // parameter for browser navigations in new tabs (intents, tabs opened through
   // "Open link in new tab"). We need to keep it above RFHM::Navigate() call to
   // capture the time needed for the RenderFrameHost initialization.
   base::TimeTicks navigation_start = base::TimeTicks::Now();
   TRACE_EVENT_INSTANT_WITH_TIMESTAMP0(
-      "navigation", "NavigationTiming navigationStart",
+      "navigation,rail", "NavigationTiming navigationStart",
       TRACE_EVENT_SCOPE_GLOBAL, navigation_start.ToInternalValue());
 
   // Determine if LoFi should be used for the navigation.
   LoFiState lofi_state = LOFI_UNSPECIFIED;
   if (!frame_tree_node->IsMainFrame()) {
     // For subframes, use the state of the top-level frame.
     lofi_state = frame_tree_node->frame_tree()
                      ->root()
                      ->current_frame_host()
                      ->last_navigation_lofi_state();
@@ skipping 863 matching lines @@
   if (pending_entry != controller_->GetVisibleEntry() ||
       !should_preserve_entry) {
     controller_->DiscardPendingEntry(true);
 
     // Also force the UI to refresh.
     controller_->delegate()->NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);
   }
 }
 
 }  // namespace content