Add RAIL tracing category to Chrome tracing.

third_party/WebKit/Source/core/paint/PaintTiming.cpp

 // Copyright 2015 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 "core/paint/PaintTiming.h"
 
 #include "core/dom/Document.h"
 #include "core/loader/DocumentLoader.h"
 #include "platform/TraceEvent.h"
 
@@ skipping 33 matching lines @@
     setFirstContentfulPaint(monotonicallyIncreasingTime());
     notifyPaintTimingChanged();
 }
 
 void PaintTiming::markFirstTextPaint()
 {
     if (m_firstTextPaint != 0.0)
         return;
     m_firstTextPaint = monotonicallyIncreasingTime();
     setFirstContentfulPaint(m_firstTextPaint);
-    TRACE_EVENT_MARK_WITH_TIMESTAMP1("blink.user_timing", "firstTextPaint", m_firstTextPaint, "frame", frame());
+    TRACE_EVENT_MARK_WITH_TIMESTAMP1("blink.user_timing,rail", "firstTextPaint", m_firstTextPaint, "frame", frame());
     notifyPaintTimingChanged();
 }
 
 void PaintTiming::markFirstImagePaint()
 {
     if (m_firstImagePaint != 0.0)
         return;
     m_firstImagePaint = monotonicallyIncreasingTime();
     setFirstContentfulPaint(m_firstImagePaint);
-    TRACE_EVENT_MARK_WITH_TIMESTAMP1("blink.user_timing", "firstImagePaint", m_firstImagePaint, "frame", frame());
+    TRACE_EVENT_MARK_WITH_TIMESTAMP1("blink.user_timing,rail", "firstImagePaint", m_firstImagePaint, "frame", frame());
     notifyPaintTimingChanged();
 }
 
 DEFINE_TRACE(PaintTiming)
 {
     visitor->trace(m_document);
     Supplement<Document>::trace(visitor);
 }
 
 PaintTiming::PaintTiming(Document& document)
@@ skipping 10 matching lines @@
 {
     if (m_document && m_document->loader())
         m_document->loader()->didChangePerformanceTiming();
 }
 
 void PaintTiming::setFirstPaint(double stamp)
 {
     if (m_firstPaint != 0.0)
         return;
     m_firstPaint = stamp;
-    TRACE_EVENT_INSTANT1("blink.user_timing", "firstPaint", TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
+    TRACE_EVENT_INSTANT1("blink.user_timing,rail", "firstPaint", TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
 }
 
 void PaintTiming::setFirstContentfulPaint(double stamp)
 {
     if (m_firstContentfulPaint != 0.0)
         return;
     setFirstPaint(stamp);
     m_firstContentfulPaint = stamp;
-    TRACE_EVENT_INSTANT1("blink.user_timing", "firstContentfulPaint", TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
+    TRACE_EVENT_INSTANT1("blink.user_timing,rail", "firstContentfulPaint", TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
 }
 
 } // namespace blink