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diff --git a/Tools/TestWebKitAPI/Tests/WebKit2/EnumerateMediaDevices.cpp b/Tools/TestWebKitAPI/Tests/WebKit2/EnumerateMediaDevices.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebKit2/EnumerateMediaDevices.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+
+#if WK_HAVE_C_SPI
+
+#if ENABLE(MEDIA_STREAM)
+#include "PlatformUtilities.h"
+#include "PlatformWebView.h"
+#include "Test.h"
+#include <WebKit/WKPreferencesRef.h>
+#include <WebKit/WKPreferencesRefPrivate.h>
+#include <WebKit/WKRetainPtr.h>
+#include <WebKit/WKUserMediaPermissionCheck.h>
+#include <string.h>
+#include <vector>
+
+namespace TestWebKitAPI {
+
+static bool loadedFirstTime;
+static bool loadedSecondTime;
+
+void checkUserMediaPermissionCallback(WKPageRef, WKFrameRef, WKSecurityOriginRef, WKSecurityOriginRef, WKUserMediaPermissionCheckRef permissionRequest, const void*)
+{
+    WKUserMediaPermissionCheckSetUserMediaAccessInfo(permissionRequest, WKStringCreateWithUTF8CString("0x123456789"), true);
+    if (!loadedFirstTime) {
+        loadedFirstTime = true;
+        return;
+    }
+
+    loadedSecondTime = true;
+}
+
+TEST(WebKit2, EnumerateDevices)
+{
+    auto context = adoptWK(WKContextCreate());
+
+    WKRetainPtr<WKPageGroupRef> pageGroup(AdoptWK, WKPageGroupCreateWithIdentifier(Util::toWK("EnumerateDevices").get()));
+    WKPreferencesRef preferences = WKPageGroupGetPreferences(pageGroup.get());
+    WKPreferencesSetMediaStreamEnabled(preferences, true);
+    WKPreferencesSetFileAccessFromFileURLsAllowed(preferences, true);
+    WKPreferencesSetMediaCaptureRequiresSecureConnection(preferences, false);
+
+    WKPageUIClientV6 uiClient;
+    memset(&uiClient, 0, sizeof(uiClient));
+    uiClient.base.version = 6;
+    uiClient.checkUserMediaPermissionForOrigin = checkUserMediaPermissionCallback;
+
+    PlatformWebView webView(context.get(), pageGroup.get());
+    WKPageSetPageUIClient(webView.page(), &uiClient.base);
+
+    auto url = adoptWK(Util::createURLForResource("enumerateMediaDevices", "html"));
+
+    // Load and kill the page.
+    WKPageLoadURL(webView.page(), url.get());
+    Util::run(&loadedFirstTime);
+    WKPageTerminate(webView.page());
+
+    // Load it again to make sure the user media process manager doesn't assert.
+    WKPageLoadURL(webView.page(), url.get());
+    Util::run(&loadedSecondTime);
+}
+
+} // namespace TestWebKitAPI
+
+#endif // ENABLE(MEDIA_STREAM)
+
+#endif // WK_HAVE_C_SPI