[WIP] WebFonts cache-aware timeout adaption

third_party/WebKit/Source/core/css/RemoteFontFaceSource.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 RemoteFontFaceSource_h
 #define RemoteFontFaceSource_h
 
 #include "core/css/CSSFontFaceSource.h"
 #include "core/fetch/FontResource.h"
 #include "wtf/Allocator.h"
@@ skipping 26 matching lines @@
   bool isLoading() const override;
   bool isLoaded() const override;
   bool isValid() const override;
   DisplayPeriod getDisplayPeriod() const { return m_period; }
 
   void beginLoadIfNeeded() override;
 
   void notifyFinished(Resource*) override;
   void fontLoadShortLimitExceeded(FontResource*) override;
   void fontLoadLongLimitExceeded(FontResource*) override;
+
+  void willReloadAfterDiskCacheMiss(const FontResource*) override;
+
   String debugName() const override { return "RemoteFontFaceSource"; }
 
   bool isBlank() override { return m_period == BlockPeriod; }
 
   // For UMA reporting
   bool hadBlankText() override { return m_histograms.hadBlankText(); }
   void paintRequested() { m_histograms.fallbackFontPainted(m_period); }
 
   DECLARE_VIRTUAL_TRACE();
 
@@ skipping 37 matching lines @@
    private:
     void recordLoadTimeHistogram(const FontResource*, int duration);
     void recordInterventionResult(bool isTriggered);
     CacheHitMetrics dataSourceMetricsValue();
     double m_loadStartTime;
     double m_blankPaintTime;
     bool m_isLongLimitExceeded;
     DataSource m_dataSource;
   };
 
+  void didBecomeVisibleFallback();
   void switchToSwapPeriod();
   void switchToFailurePeriod();
   bool shouldTriggerWebFontsIntervention();
+  bool shouldUseInvisibleFallback() const;
 
   Member<FontResource> m_font;
   Member<CSSFontSelector> m_fontSelector;
   const FontDisplay m_display;
   DisplayPeriod m_period;
   FontLoadHistograms m_histograms;
   bool m_isInterventionTriggered;
 };
 
 }  // namespace blink
 
 #endif