Move webfont usage metrics reporting to FontResource

Source/core/fetch/FontResource.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/fetch/FontResource.h"
 
 #include "core/fetch/ResourceClient.h"
 #include "core/fetch/ResourceClientWalker.h"
 #include "core/fetch/TextResourceDecoder.h"
+#include "core/platform/HistogramSupport.h"
 #include "core/platform/SharedBuffer.h"
 #include "core/platform/graphics/FontCustomPlatformData.h"
 #include "core/platform/graphics/FontPlatformData.h"
+#include "wtf/CurrentTime.h"
 
 #if ENABLE(SVG_FONTS)
 #include "SVGNames.h"
 #include "core/dom/NodeList.h"
 #include "core/svg/SVGDocument.h"
 #include "core/svg/SVGFontElement.h"
 #endif
 
 namespace WebCore {
 
@@ skipping 24 matching lines @@
 
 void FontResource::beginLoadIfNeeded(ResourceFetcher* dl)
 {
     if (!m_loadInitiated) {
         m_loadInitiated = true;
         Resource::load(dl, m_options);
 
         ResourceClientWalker<FontResourceClient> walker(m_clients);
         while (FontResourceClient* client = walker.next())
             client->didStartFontLoad(this);
+        m_histograms.loadStarted();
     }
 }
 
 bool FontResource::ensureCustomFontData()
 {
     if (!m_fontData && !errorOccurred() && !isLoading() && m_data) {
         m_fontData = FontCustomPlatformData::create(m_data.get());
         if (!m_fontData)
             setStatus(DecodeError);
     }
@@ skipping 65 matching lines @@
     Resource::allClientsRemoved();
 }
 
 void FontResource::checkNotify()
 {
     ResourceClientWalker<FontResourceClient> w(m_clients);
     while (FontResourceClient* c = w.next())
         c->fontLoaded(this);
 }
 
+void FontResource::willUseFontData()
+{
+    if (!isLoaded())
+        m_histograms.willUseFontData();
 }
+
+FontResource::FontResourceHistograms::~FontResourceHistograms()
+{
+    if (m_styledTime > 0)
+        HistogramSupport::histogramEnumeration("WebFont.Resource.UsageType", StyledButNotUsed, UsageTypeMax);
+}
+
+void FontResource::FontResourceHistograms::willUseFontData()
+{
+    if (!m_styledTime)
+        m_styledTime = currentTimeMS();
+}
+
+void FontResource::FontResourceHistograms::loadStarted()
+{
+    if (m_styledTime < 0)
+        return;
+    if (!m_styledTime) {
+        HistogramSupport::histogramEnumeration("WebFont.Resource.UsageType", NotStyledButUsed, UsageTypeMax);
+    } else {
+        int duration = static_cast<int>(currentTimeMS() - m_styledTime);
+        HistogramSupport::histogramCustomCounts("WebFont.Resource.StyleRecalcToDownloadLatency", duration, 0, 10000, 50);
+        HistogramSupport::histogramEnumeration("WebFont.Resource.UsageType", StyledAndUsed, UsageTypeMax);
+    }
+    m_styledTime = -1;
+}
+
+}