Add UMA to measure font-display value

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
 #include "core/dom/DOMArrayBufferView.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "platform/FontFamilyNames.h"
 #include "platform/SharedBuffer.h"
+#include "public/platform/Platform.h"
 
 namespace blink {
 
 static PassRefPtrWillBeRawPtr<CSSValue> parseCSSValue(const Document* document, const String& value, CSSPropertyID propertyID)
 {
     CSSParserContext context(*document, UseCounter::getFrom(document));
     return CSSParser::parseFontFaceDescriptor(propertyID, value, context);
 }
 
 PassRefPtrWillBeRawPtr<FontFace> FontFace::create(ExecutionContext* context, const AtomicString& family, StringOrArrayBufferOrArrayBufferView& source, const FontFaceDescriptors& descriptors)
@@ skipping 521 matching lines @@
                     source = adoptPtrWillBeNoop(new RemoteFontFaceSource(fetched, fontLoader, CSSValueToFontDisplay(m_display.get())));
                 }
             }
         } else {
             source = adoptPtrWillBeNoop(new LocalFontFaceSource(item->resource()));
         }
 
         if (source)
             m_cssFontFace->addSource(source.release());
     }
+
+    if (m_display)
+        Platform::current()->histogramEnumeration("WebFont.FontDisplayValue", CSSValueToFontDisplay(m_display.get()), FontDisplayEnumMax);
 }
 
 void FontFace::initCSSFontFace(const unsigned char* data, size_t size)
 {
     m_cssFontFace = createCSSFontFace(this, m_unicodeRange.get());
     if (m_error)
         return;
 
     RefPtr<SharedBuffer> buffer = SharedBuffer::create(data, size);
     OwnPtrWillBeRawPtr<BinaryDataFontFaceSource> source = adoptPtrWillBeNoop(new BinaryDataFontFaceSource(buffer.get(), m_otsParseMessage));
@@ skipping 24 matching lines @@
 {
     return m_cssFontFace->hadBlankText();
 }
 
 bool FontFace::hasPendingActivity() const
 {
     return m_status == Loading && executionContext() && !executionContext()->activeDOMObjectsAreStopped();
 }
 
 } // namespace blink