WebFonts: measure network loading time

third_party/WebKit/Source/core/css/RemoteFontFaceSource.h

Index: third_party/WebKit/Source/core/css/RemoteFontFaceSource.h
diff --git a/third_party/WebKit/Source/core/css/RemoteFontFaceSource.h b/third_party/WebKit/Source/core/css/RemoteFontFaceSource.h
index 6bb1e5fc6f1c1bf59bd20ebfb55e6217406994ab..2c9fd5db26b9fb86602384a156897764b2f49325 100644
--- a/third_party/WebKit/Source/core/css/RemoteFontFaceSource.h
+++ b/third_party/WebKit/Source/core/css/RemoteFontFaceSource.h
@@ -27,6 +27,7 @@ class RemoteFontFaceSource final : public CSSFontFaceSource, public FontResource
     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;
@@ -64,14 +65,14 @@ private:
         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;
@@ -86,7 +87,7 @@ private:
     DisplayPeriod m_period;
     FontLoadHistograms m_histograms;
     bool m_isInterventionTriggered;
-    bool m_isLoadedFromMemoryCache;
+    DataSource m_dataSource;
 };
 
 } // namespace blink