WebFonts intervention: Add metrics only for miss-cached loading

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 46 matching lines @@
     PassRefPtr<SimpleFontData> createLoadingFallbackFontData(const FontDescription&);
     void pruneTable();
 
 private:
     class FontLoadHistograms {
         DISALLOW_NEW();
     public:
         FontLoadHistograms() : m_loadStartTime(0), m_blankPaintTime(0), m_isLongLimitExceeded(false) { }
         void loadStarted();
         void fallbackFontPainted(DisplayPeriod);
-        void fontLoaded(bool isInterventionTriggered);
+        void fontLoaded(bool isInterventionTriggered, bool isLoadedFromCache);

[kinuko, 2016/06/27 12:06:24]

usually prefer enum over bool... but ok this is internal histogram class

         void longLimitExceeded(bool isInterventionTriggered);
         void recordFallbackTime(const FontResource*);
         void recordRemoteFont(const FontResource*);
         bool hadBlankText() { return m_blankPaintTime; }
     private:
         void recordLoadTimeHistogram(const FontResource*, int duration);
-        void recordInterventionResult(bool triggered);
+        void recordInterventionResult(bool triggered, bool loadedFromCache);

[kinuko, 2016/06/27 12:06:24]

loadedFromCache -> isLoadedFromCache for consistency?

[Takashi Toyoshima, 2016/06/28 05:38:18]

Done with triggered -> isTriggered.

         double m_loadStartTime;
         double m_blankPaintTime;
         bool m_isLongLimitExceeded;
     };
 
     void switchToSwapPeriod();
     void switchToFailurePeriod();
 
     Member<FontResource> m_font;
     Member<CSSFontSelector> m_fontSelector;
     const FontDisplay m_display;
     DisplayPeriod m_period;
     FontLoadHistograms m_histograms;
     bool m_isInterventionTriggered;
+    bool m_isLoadedFromMemoryCache;
 };
 
 } // namespace blink
 
 #endif