Move FirstMeaningfulPaintDetector timer to frame-specific TaskRunnerTimer

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

 // Copyright 2016 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/FirstMeaningfulPaintDetector.h"
 
 #include "core/css/FontFaceSet.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/paint/PaintTiming.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 
 namespace blink {
 
 namespace {
 
 // Web fonts that laid out more than this number of characters block First
 // Meaningful Paint.
 const int kBlankCharactersThreshold = 200;
 
 // FirstMeaningfulPaintDetector stops observing layouts and reports First
 // Meaningful Paint when this duration passed from last network activity.
 const double kSecondsWithoutNetworkActivityThreshold = 0.5;
 
 }  // namespace
 
 FirstMeaningfulPaintDetector& FirstMeaningfulPaintDetector::from(
     Document& document) {
   return PaintTiming::from(document).firstMeaningfulPaintDetector();
 }
 
 FirstMeaningfulPaintDetector::FirstMeaningfulPaintDetector(
-    PaintTiming* paintTiming)
+    PaintTiming* paintTiming,
+    Document& document)
     : m_paintTiming(paintTiming),
       m_networkStableTimer(
+          TaskRunnerHelper::get(TaskType::UnspecedTimer, &document),
           this,
           &FirstMeaningfulPaintDetector::networkStableTimerFired) {}
 
 Document* FirstMeaningfulPaintDetector::document() {
   return m_paintTiming->supplementable();
 }
 
 // Computes "layout significance" (http://goo.gl/rytlPL) of a layout operation.
 // Significance of a layout is the number of layout objects newly added to the
 // layout tree, weighted by page height (before and after the layout).
@@ skipping 77 matching lines @@
   if (m_provisionalFirstMeaningfulPaint)
     m_paintTiming->setFirstMeaningfulPaint(m_provisionalFirstMeaningfulPaint);
   m_state = Reported;
 }
 
 DEFINE_TRACE(FirstMeaningfulPaintDetector) {
   visitor->trace(m_paintTiming);
 }
 
 }  // namespace blink