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diff --git a/Source/WebCore/page/ResourceUsageData.h b/Source/WebCore/page/ResourceUsageData.h
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+++ b/Source/WebCore/page/ResourceUsageData.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. AND ITS CONTRIBUTORS ``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 ITS 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
+
+#if ENABLE(RESOURCE_USAGE)
+
+#include <array>
+
+namespace WebCore {
+
+namespace MemoryCategory {
+static const unsigned bmalloc = 0;
+static const unsigned LibcMalloc = 1;
+static const unsigned JSJIT = 2;
+static const unsigned Images = 3;
+static const unsigned GCHeap = 4;
+static const unsigned GCOwned = 5;
+static const unsigned Other = 6;
+static const unsigned Layers = 7;
+static const unsigned NumberOfCategories = 8;
+}
+
+struct MemoryCategoryInfo {
+    MemoryCategoryInfo() { } // Needed for std::array.
+    MemoryCategoryInfo(unsigned category, bool subcategory = false)
+        : isSubcategory(subcategory)
+        , type(category)
+    {
+    }
+
+    size_t totalSize() const { return dirtySize + externalSize; }
+
+    size_t dirtySize { 0 };
+    size_t reclaimableSize { 0 };
+    size_t externalSize { 0 };
+    bool isSubcategory { false };
+    unsigned type { MemoryCategory::NumberOfCategories };
+};
+
+struct ResourceUsageData {
+    ResourceUsageData();
+    ResourceUsageData(const ResourceUsageData& data);
+
+    float cpu { 0 };
+    size_t totalDirtySize { 0 };
+    size_t totalExternalSize { 0 };
+    std::array<MemoryCategoryInfo, MemoryCategory::NumberOfCategories> categories;
+    double timeOfNextEdenCollection { 0 };
+    double timeOfNextFullCollection { 0 };
+};
+
+} // namespace WebCore
+
+#endif // ResourceUsageData_h