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diff --git a/Source/WebCore/page/PerformanceLogging.h b/Source/WebCore/page/PerformanceLogging.h
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+/*
+ * Copyright (C) 2016 Apple 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <wtf/HashCountedSet.h>
+#include <wtf/HashMap.h>
+
+namespace WebCore {
+
+class MainFrame;
+
+enum class ShouldIncludeExpensiveComputations { No, Yes };
+
+class PerformanceLogging {
+    WTF_MAKE_FAST_ALLOCATED;
+    WTF_MAKE_NONCOPYABLE(PerformanceLogging);
+public:
+    explicit PerformanceLogging(MainFrame&);
+
+    enum PointOfInterest {
+        MainFrameLoadStarted,
+        MainFrameLoadCompleted,
+    };
+
+    void didReachPointOfInterest(PointOfInterest);
+
+    WEBCORE_EXPORT static HashCountedSet<const char*> javaScriptObjectCounts();
+    WEBCORE_EXPORT static HashMap<const char*, size_t> memoryUsageStatistics(ShouldIncludeExpensiveComputations);
+    WEBCORE_EXPORT static std::optional<uint64_t> physicalFootprint();
+
+private:
+    static void getPlatformMemoryUsageStatistics(HashMap<const char*, size_t>&);
+
+    MainFrame& m_mainFrame;
+};
+
+}