Remove custom counts histogram from the blink API.

third_party/WebKit/Source/core/css/FontFaceSet.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:
  *
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 #include "core/css/FontFaceCache.h"
 #include "core/css/FontFaceSetLoadEvent.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/style/StyleInheritedData.h"
+#include "platform/Histogram.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 static const int defaultFontSize = 10;
 static const char defaultFontFamily[] = "sans-serif";
 
 class LoadFontPromiseResolver final : public FontFace::LoadFontCallback {
 public:
     static PassRefPtrWillBeRawPtr<LoadFontPromiseResolver> create(FontFaceArray faces, ScriptState* scriptState)
@@ skipping 419 matching lines @@
     if (fontFace->hadBlankText())
         m_status = HadBlankText;
     else if (m_status == NoWebFonts)
         m_status = DidNotHaveBlankText;
 }
 
 void FontFaceSet::FontLoadHistogram::record()
 {
     if (!m_recorded) {
         m_recorded = true;
-        Platform::current()->histogramCustomCounts("WebFont.WebFontsInPage", m_count, 1, 100, 50);
+        DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, webFontsInPageHistogram, new CustomCountHistogram("WebFont.WebFontsInPage", 1, 100, 50));

[esprehn, 2016/02/04 23:25:23]

FontFaceSet is main thread only today, someday it might need to be thread safe,
but it isn't in general today.

+        webFontsInPageHistogram.count(m_count);
     }
     if (m_status == HadBlankText || m_status == DidNotHaveBlankText) {
         Platform::current()->histogramEnumeration("WebFont.HadBlankText", m_status == HadBlankText ? 1 : 0, 2);
         m_status = Reported;
     }
 }
 
 static const char* supplementName()
 {
     return "FontFaceSet";
@@ skipping 50 matching lines @@
     visitor->trace(m_failedFonts);
     visitor->trace(m_nonCSSConnectedFaces);
     visitor->trace(m_asyncRunner);
     HeapSupplement<Document>::trace(visitor);
 #endif
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink