FontLoadHistograms: move maySetDataSource() impl out of header

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

Index: third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp
diff --git a/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp b/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp
index 349bdd623187bc71cb4a24bd7740691ff44864ef..fd4d03fc9304ec05561117053f2a44b10eefd6ce 100644
--- a/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp
+++ b/third_party/WebKit/Source/core/css/RemoteFontFaceSource.cpp
@@ -285,6 +285,19 @@ void RemoteFontFaceSource::FontLoadHistograms::recordRemoteFont(const FontResour
     }
 }
 
+void RemoteFontFaceSource::FontLoadHistograms::maySetDataSource(DataSource dataSource)
+{
+    if (m_dataSource != FromUnknown)
+        return;
+    // Classify as memory cache hit if |m_loadStartTime| is not set, i.e.
+    // this RemoteFontFaceSource instance didn't trigger FontResource
+    // loading.
+    if (m_loadStartTime == 0)
+        m_dataSource = FromMemoryCache;
+    else
+        m_dataSource = dataSource;
+}
+
 void RemoteFontFaceSource::FontLoadHistograms::recordLoadTimeHistogram(const FontResource* font, int duration)
 {
     CHECK_NE(FromUnknown, m_dataSource);