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diff --git a/Tools/TestWebKitAPI/Tests/WebKit2/WKPageIsPlayingAudio.cpp b/Tools/TestWebKitAPI/Tests/WebKit2/WKPageIsPlayingAudio.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebKit2/WKPageIsPlayingAudio.cpp
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#include "config.h"
+
+#if WK_HAVE_C_SPI
+
+#include "PlatformUtilities.h"
+#include "PlatformWebView.h"
+#include "Test.h"
+#include <JavaScriptCore/JSRetainPtr.h>
+#include <JavaScriptCore/JavaScriptCore.h>
+#include <WebKit/WKSerializedScriptValue.h>
+#include <WebKit/WKPagePrivate.h>
+#include <WebKit/WKPreferencesRef.h>
+#include <WebKit/WKPreferencesRefPrivate.h>
+
+// This test loads file-with-video.html. It first checks to make sure WKPageIsPlayingAudio() returns
+// false for the page. Then it calls a JavaScript method to play the video, waits for
+// WKPageUIClient::isPlayingAudioDidChange() to get called, and checks that WKPageIsPlayingAudio() now
+// returns true for the page.
+
+namespace TestWebKitAPI {
+
+static bool isMSEEnabledChanged;
+static bool isMSEEnabled;
+static bool didFinishLoad;
+static bool isPlayingAudioChanged;
+
+static void nullJavaScriptCallback(WKSerializedScriptValueRef, WKErrorRef error, void*)
+{
+}
+
+static void isMSEEnabledCallback(WKSerializedScriptValueRef serializedResultValue, WKErrorRef error, void*)
+{
+    JSGlobalContextRef scriptContext = JSGlobalContextCreate(0);
+
+    JSValueRef resultValue = WKSerializedScriptValueDeserialize(serializedResultValue, scriptContext, 0);
+    EXPECT_TRUE(JSValueIsBoolean(scriptContext, resultValue));
+
+    isMSEEnabledChanged = true;
+    isMSEEnabled = JSValueToBoolean(scriptContext, resultValue);
+
+    JSGlobalContextRelease(scriptContext);
+}
+
+static void didFinishLoadForFrame(WKPageRef page, WKFrameRef, WKTypeRef, const void*)
+{
+    didFinishLoad = true;
+}
+
+static void isPlayingAudioDidChangeCallback(WKPageRef page, const void*)
+{
+    isPlayingAudioChanged = true;
+}
+
+static void setUpClients(WKPageRef page)
+{
+    WKPageLoaderClientV0 loaderClient;
+    memset(&loaderClient, 0, sizeof(loaderClient));
+
+    loaderClient.base.version = 0;
+    loaderClient.didFinishLoadForFrame = didFinishLoadForFrame;
+
+    WKPageSetPageLoaderClient(page, &loaderClient.base);
+
+    WKPageUIClientV5 uiClient;
+    memset(&uiClient, 0, sizeof(uiClient));
+
+    uiClient.base.version = 5;
+    uiClient.isPlayingAudioDidChange = isPlayingAudioDidChangeCallback;
+
+    WKPageSetPageUIClient(page, &uiClient.base);
+}
+
+TEST(WebKit2, WKPageIsPlayingAudio)
+{
+    WKRetainPtr<WKContextRef> context = adoptWK(WKContextCreate());
+
+    PlatformWebView webView(context.get());
+    setUpClients(webView.page());
+
+    WKRetainPtr<WKURLRef> url = adoptWK(Util::createURLForResource("file-with-video", "html"));
+    WKPageLoadURL(webView.page(), url.get());
+
+    Util::run(&didFinishLoad);
+
+    EXPECT_FALSE(WKPageIsPlayingAudio(webView.page()));
+    WKPageRunJavaScriptInMainFrame(webView.page(), Util::toWK("playVideo()").get(), 0, nullJavaScriptCallback);
+
+    Util::run(&isPlayingAudioChanged);
+    EXPECT_TRUE(WKPageIsPlayingAudio(webView.page()));
+}
+
+TEST(WebKit2, MSEIsPlayingAudio)
+{
+    WKRetainPtr<WKContextRef> context = adoptWK(WKContextCreate());
+
+    WKRetainPtr<WKPageGroupRef> pageGroup(AdoptWK, WKPageGroupCreateWithIdentifier(Util::toWK("MSEIsPlayingAudioPageGroup").get()));
+    WKPreferencesRef preferences = WKPageGroupGetPreferences(pageGroup.get());
+    WKPreferencesSetMediaSourceEnabled(preferences, true);
+    WKPreferencesSetFileAccessFromFileURLsAllowed(preferences, true);
+
+    PlatformWebView webView(context.get(), pageGroup.get());
+    setUpClients(webView.page());
+
+    WKRetainPtr<WKURLRef> url = adoptWK(Util::createURLForResource("file-with-mse", "html"));
+    didFinishLoad = false;
+    WKPageLoadURL(webView.page(), url.get());
+
+    Util::run(&didFinishLoad);
+
+    // Bail out of the test early if the platform does not support MSE.
+    isMSEEnabledChanged = false;
+    WKPageRunJavaScriptInMainFrame(webView.page(), Util::toWK("window.MediaSource !== undefined").get(), 0, isMSEEnabledCallback);
+    Util::run(&isMSEEnabledChanged);
+    if (!isMSEEnabled)
+        return;
+
+    EXPECT_FALSE(WKPageIsPlayingAudio(webView.page()));
+    isPlayingAudioChanged = false;
+    WKPageRunJavaScriptInMainFrame(webView.page(), Util::toWK("playVideo()").get(), 0, nullJavaScriptCallback);
+
+    Util::run(&isPlayingAudioChanged);
+    EXPECT_TRUE(WKPageIsPlayingAudio(webView.page()));
+}
+
+} // namespace TestWebKitAPI
+
+#endif