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diff --git a/Source/WebCore/page/RuntimeEnabledFeatures.h b/Source/WebCore/page/RuntimeEnabledFeatures.h
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+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2013-2017 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:
+ *
+ *     * 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 "PlatformExportMacros.h"
+#include <wtf/NeverDestroyed.h>
+
+namespace WebCore {
+
+// A class that stores static enablers for all experimental features. Note that
+// the method names must line up with the JavaScript method they enable for code
+// generation to work properly.
+
+class RuntimeEnabledFeatures {
+    WTF_MAKE_NONCOPYABLE(RuntimeEnabledFeatures);
+public:
+    void setDOMIteratorEnabled(bool isEnabled) { m_isDOMIteratorEnabled = isEnabled; }
+    bool domIteratorEnabled() const { return m_isDOMIteratorEnabled; }
+
+    void setGeolocationEnabled(bool isEnabled) { m_isGeolocationEnabled = isEnabled; }
+    bool geolocationEnabled() const { return m_isGeolocationEnabled; }
+
+    void setLinkPreloadEnabled(bool isEnabled) { m_isLinkPreloadEnabled = isEnabled; }
+    bool linkPreloadEnabled() const { return m_isLinkPreloadEnabled; }
+
+    void setResourceTimingEnabled(bool isEnabled) { m_isResourceTimingEnabled = isEnabled; }
+    bool resourceTimingEnabled() const { return m_isResourceTimingEnabled; }
+
+    void setUserTimingEnabled(bool isEnabled) { m_isUserTimingEnabled = isEnabled; }
+    bool userTimingEnabled() const { return m_isUserTimingEnabled; }
+
+    bool performanceTimelineEnabled() const { return resourceTimingEnabled() || userTimingEnabled(); }
+
+    void setShadowDOMEnabled(bool isEnabled) { m_isShadowDOMEnabled = isEnabled; }
+    bool shadowDOMEnabled() const { return m_isShadowDOMEnabled; }
+
+    void setInputEventsEnabled(bool isEnabled) { m_inputEventsEnabled = isEnabled; }
+    bool inputEventsEnabled() const { return m_inputEventsEnabled; }
+
+    void setInteractiveFormValidationEnabled(bool isEnabled) { m_isInteractiveFormValidationEnabled = isEnabled; }
+    bool interactiveFormValidationEnabled() const { return m_isInteractiveFormValidationEnabled; }
+
+    void setCustomElementsEnabled(bool areEnabled) { m_areCustomElementsEnabled = areEnabled; }
+    bool customElementsEnabled() const { return m_areCustomElementsEnabled; }
+
+    void setModernMediaControlsEnabled(bool areEnabled) { m_areModernMediaControlsEnabled = areEnabled; }
+    bool modernMediaControlsEnabled() const { return m_areModernMediaControlsEnabled; }
+
+#if ENABLE(INDEXED_DATABASE_IN_WORKERS)
+    void setIndexedDBWorkersEnabled(bool isEnabled) { m_isIndexedDBWorkersEnabled = isEnabled; }
+    bool indexedDBWorkersEnabled() const { return m_isIndexedDBWorkersEnabled; }
+#endif
+
+#if ENABLE(FONT_LOAD_EVENTS)
+    void setFontLoadEventsEnabled(bool isEnabled) { m_isFontLoadEventsEnabled = isEnabled; }
+    bool fontLoadEventsEnabled() const { return m_isFontLoadEventsEnabled; }
+#endif
+
+#if ENABLE(MEDIA_STREAM)
+    bool mediaStreamEnabled() const { return m_isMediaStreamEnabled; }
+    void setMediaStreamEnabled(bool isEnabled) { m_isMediaStreamEnabled = isEnabled; }
+#endif
+
+#if ENABLE(WEB_RTC)
+    bool peerConnectionEnabled() const { return m_isMediaStreamEnabled && m_isPeerConnectionEnabled; }
+    void setPeerConnectionEnabled(bool isEnabled) { m_isPeerConnectionEnabled = isEnabled; }
+#endif
+
+#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
+    void setLegacyCSSVendorPrefixesEnabled(bool isEnabled) { m_isLegacyCSSVendorPrefixesEnabled = isEnabled; }
+    bool legacyCSSVendorPrefixesEnabled() const { return m_isLegacyCSSVendorPrefixesEnabled; }
+#endif
+
+#if ENABLE(INPUT_TYPE_DATE)
+    bool inputTypeDateEnabled() const { return m_isInputTypeDateEnabled; }
+    void setInputTypeDateEnabled(bool isEnabled) { m_isInputTypeDateEnabled = isEnabled; }
+#endif
+
+#if ENABLE(INPUT_TYPE_DATETIME_INCOMPLETE)
+    bool inputTypeDateTimeEnabled() const { return m_isInputTypeDateTimeEnabled; }
+    void setInputTypeDateTimeEnabled(bool isEnabled) { m_isInputTypeDateTimeEnabled = isEnabled; }
+#endif
+
+#if ENABLE(INPUT_TYPE_DATETIMELOCAL)
+    bool inputTypeDateTimeLocalEnabled() const { return m_isInputTypeDateTimeLocalEnabled; }
+    void setInputTypeDateTimeLocalEnabled(bool isEnabled) { m_isInputTypeDateTimeLocalEnabled = isEnabled; }
+#endif
+
+#if ENABLE(INPUT_TYPE_MONTH)
+    bool inputTypeMonthEnabled() const { return m_isInputTypeMonthEnabled; }
+    void setInputTypeMonthEnabled(bool isEnabled) { m_isInputTypeMonthEnabled = isEnabled; }
+#endif
+
+#if ENABLE(INPUT_TYPE_TIME)
+    bool inputTypeTimeEnabled() const { return m_isInputTypeTimeEnabled; }
+    void setInputTypeTimeEnabled(bool isEnabled) { m_isInputTypeTimeEnabled = isEnabled; }
+#endif
+
+#if ENABLE(INPUT_TYPE_WEEK)
+    bool inputTypeWeekEnabled() const { return m_isInputTypeWeekEnabled; }
+    void setInputTypeWeekEnabled(bool isEnabled) { m_isInputTypeWeekEnabled = isEnabled; }
+#endif
+
+#if ENABLE(GAMEPAD)
+    void setGamepadsEnabled(bool areEnabled) { m_areGamepadsEnabled = areEnabled; }
+    bool gamepadsEnabled() const { return m_areGamepadsEnabled; }
+#endif
+
+#if ENABLE(CSS_ANIMATIONS_LEVEL_2)
+    // FIXME: This is not used.
+    void setAnimationTriggersEnabled(bool areEnabled) { m_areAnimationTriggersEnabled = areEnabled; }
+    bool animationTriggersEnabled() const { return m_areAnimationTriggersEnabled; }
+#endif
+
+#if ENABLE(WEB_ANIMATIONS)
+    void setWebAnimationsEnabled(bool areEnabled) { m_areWebAnimationsEnabled = areEnabled; }
+    bool webAnimationsEnabled() const { return m_areWebAnimationsEnabled; }
+#endif
+
+#if ENABLE(WEBGL2)
+    void setWebGL2Enabled(bool isEnabled) { m_isWebGL2Enabled = isEnabled; }
+    bool webGL2Enabled() const { return m_isWebGL2Enabled; }
+#endif
+
+#if ENABLE(FETCH_API)
+    void setFetchAPIEnabled(bool isEnabled) { m_isFetchAPIEnabled = isEnabled; }
+    bool fetchAPIEnabled() const { return m_isFetchAPIEnabled; }
+#endif
+
+#if ENABLE(DOWNLOAD_ATTRIBUTE)
+    void setDownloadAttributeEnabled(bool isEnabled) { m_isDownloadAttributeEnabled = isEnabled; }
+    bool downloadAttributeEnabled() const { return m_isDownloadAttributeEnabled; }
+#endif
+
+    void setCSSGridLayoutEnabled(bool isEnabled) { m_cssGridLayoutEnabled = isEnabled; }
+    bool isCSSGridLayoutEnabled() const { return m_cssGridLayoutEnabled; }
+
+#if ENABLE(INTERSECTION_OBSERVER)
+    void setIntersectionObserverEnabled(bool isEnabled) { m_intersectionObserverEnabled = isEnabled; }
+    bool intersectionObserverEnabled() const { return m_intersectionObserverEnabled; }
+#endif
+
+#if ENABLE(ENCRYPTED_MEDIA)
+    void setEncryptedMediaAPIEnabled(bool isEnabled) { m_encryptedMediaAPIEnabled = isEnabled; }
+    bool encryptedMediaAPIEnabled() const { return m_encryptedMediaAPIEnabled; }
+#endif
+
+#if ENABLE(SUBTLE_CRYPTO)
+    void setSubtleCryptoEnabled(bool isEnabled) { m_isSubtleCryptoEnabled = isEnabled; }
+    bool subtleCryptoEnabled() const { return m_isSubtleCryptoEnabled; }
+#endif
+
+#if ENABLE(VIDEO)
+    bool audioEnabled() const;
+    bool htmlMediaElementEnabled() const;
+    bool htmlAudioElementEnabled() const;
+    bool htmlVideoElementEnabled() const;
+    bool htmlSourceElementEnabled() const;
+    bool mediaControllerEnabled() const;
+    bool mediaErrorEnabled() const;
+    bool timeRangesEnabled() const;
+#endif
+
+#if ENABLE(WEB_SOCKETS)
+    bool webSocketEnabled() const;
+#endif
+
+    WEBCORE_EXPORT static RuntimeEnabledFeatures& sharedFeatures();
+
+private:
+    // Never instantiate.
+    RuntimeEnabledFeatures();
+
+    bool m_areModernMediaControlsEnabled { false };
+    bool m_isLinkPreloadEnabled { false };
+    bool m_isResourceTimingEnabled { false };
+    bool m_isUserTimingEnabled { false };
+    bool m_isInteractiveFormValidationEnabled { false };
+
+    bool m_isDOMIteratorEnabled { true };
+    bool m_isGeolocationEnabled { true };
+    bool m_isShadowDOMEnabled { true };
+    bool m_areCustomElementsEnabled { true };
+    bool m_inputEventsEnabled { true };
+
+#if ENABLE(INDEXED_DATABASE_IN_WORKERS)
+    bool m_isIndexedDBWorkersEnabled { true };
+#endif
+
+#if ENABLE(MEDIA_STREAM)
+    bool m_isMediaStreamEnabled { true };
+#endif
+
+#if ENABLE(WEB_RTC)
+    bool m_isPeerConnectionEnabled { true };
+#endif
+
+#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
+    bool m_isLegacyCSSVendorPrefixesEnabled { false };
+#endif
+
+#if ENABLE(INPUT_TYPE_DATE)
+    bool m_isInputTypeDateEnabled { true };
+#endif
+
+#if ENABLE(INPUT_TYPE_DATETIME_INCOMPLETE)
+    bool m_isInputTypeDateTimeEnabled { false };
+#endif
+
+#if ENABLE(INPUT_TYPE_DATETIMELOCAL)
+    bool m_isInputTypeDateTimeLocalEnabled { true };
+#endif
+
+#if ENABLE(INPUT_TYPE_MONTH)
+    bool m_isInputTypeMonthEnabled { true };
+#endif
+
+#if ENABLE(INPUT_TYPE_TIME)
+    bool m_isInputTypeTimeEnabled { true };
+#endif
+
+#if ENABLE(INPUT_TYPE_WEEK)
+    bool m_isInputTypeWeekEnabled { true };
+#endif
+
+#if ENABLE(FONT_LOAD_EVENTS)
+    bool m_isFontLoadEventsEnabled { true };
+#endif
+
+#if ENABLE(GAMEPAD)
+    bool m_areGamepadsEnabled { false };
+#endif
+
+#if ENABLE(CSS_ANIMATIONS_LEVEL_2)
+    bool m_areAnimationTriggersEnabled { false };
+#endif
+
+#if ENABLE(WEB_ANIMATIONS)
+    bool m_areWebAnimationsEnabled { false };
+#endif
+
+#if ENABLE(WEBGL2)
+    bool m_isWebGL2Enabled { false };
+#endif
+
+#if ENABLE(FETCH_API)
+    bool m_isFetchAPIEnabled { true };
+#endif
+
+#if ENABLE(DOWNLOAD_ATTRIBUTE)
+    bool m_isDownloadAttributeEnabled { false };
+#endif
+
+    bool m_cssGridLayoutEnabled { true };
+
+#if ENABLE(ENCRYPTED_MEDIA)
+    bool m_encryptedMediaAPIEnabled { false };
+#endif
+
+#if ENABLE(INTERSECTION_OBSERVER)
+    bool m_intersectionObserverEnabled { false };
+#endif
+
+#if ENABLE(SUBTLE_CRYPTO)
+    bool m_isSubtleCryptoEnabled { true };
+#endif
+
+    friend class WTF::NeverDestroyed<RuntimeEnabledFeatures>;
+};
+
+} // namespace WebCore