WebFonts: measure network loading time

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"
 
 namespace blink {
 
 class CSSFontSelector;
 
 enum FontDisplay {
     FontDisplayAuto,
     FontDisplayBlock,
     FontDisplaySwap,
     FontDisplayFallback,
     FontDisplayOptional,
     FontDisplayEnumMax
 };
 
 class RemoteFontFaceSource final : public CSSFontFaceSource, public FontResourceClient {
     USING_PRE_FINALIZER(RemoteFontFaceSource, dispose);
     USING_GARBAGE_COLLECTED_MIXIN(RemoteFontFaceSource);
 public:
     enum DisplayPeriod { BlockPeriod, SwapPeriod, FailurePeriod };
+    enum DataSource { FromUnknown, FromDataURL, FromMemoryCache, FromDiskCache, FromNetwork };
 
     explicit RemoteFontFaceSource(FontResource*, CSSFontSelector*, FontDisplay);
     ~RemoteFontFaceSource() override;
     void dispose();
 
     bool isLoading() const override;
     bool isLoaded() const override;
     bool isValid() const override;
     DisplayPeriod getDisplayPeriod() const { return m_period; }
 
@@ skipping 17 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, bool isLoadedFromNetwork);
-        void longLimitExceeded(bool isInterventionTriggered);
+        void fontLoaded(bool isInterventionTriggered, DataSource);
+        void longLimitExceeded(bool isInterventionTriggered, DataSource);
         void recordFallbackTime(const FontResource*);
-        void recordRemoteFont(const FontResource*, bool isLoadedFromMemoryCache);
+        void recordRemoteFont(const FontResource*, DataSource);
         bool hadBlankText() { return m_blankPaintTime; }
     private:
-        void recordLoadTimeHistogram(const FontResource*, int duration);
-        void recordInterventionResult(bool isTriggered, bool isLoadedFromNetwork);
+        void recordLoadTimeHistogram(const FontResource*, int duration, DataSource);
+        void recordInterventionResult(bool isTriggered, DataSource);
         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;
+    DataSource m_dataSource;
 };
 
 } // namespace blink
 
 #endif