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diff --git a/Tools/TestWebKitAPI/Tests/WebKit2/mac/GetBackingScaleFactor.mm b/Tools/TestWebKitAPI/Tests/WebKit2/mac/GetBackingScaleFactor.mm
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+/*
+ * Copyright (C) 2011 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.
+ */
+
+#import "config.h"
+
+#import "PlatformUtilities.h"
+#import "SyntheticBackingScaleFactorWindow.h"
+#import "Test.h"
+#import <WebKit2/WKViewPrivate.h>
+#import <wtf/RetainPtr.h>
+
+namespace TestWebKitAPI {
+
+static bool messageReceived;
+static double backingScaleFactor;
+
+static void didReceiveMessageFromInjectedBundle(WKContextRef context, WKStringRef messageName, WKTypeRef messageBody, const void*)
+{
+    messageReceived = true;
+    EXPECT_WK_STREQ("DidGetBackingScaleFactor", messageName);
+    ASSERT_NOT_NULL(messageBody);
+    EXPECT_EQ(WKDoubleGetTypeID(), WKGetTypeID(messageBody));
+    backingScaleFactor = WKDoubleGetValue(static_cast<WKDoubleRef>(messageBody));
+}
+
+static void setInjectedBundleClient(WKContextRef context)
+{
+    WKContextInjectedBundleClient injectedBundleClient;
+    memset(&injectedBundleClient, 0, sizeof(injectedBundleClient));
+    injectedBundleClient.didReceiveMessageFromInjectedBundle = didReceiveMessageFromInjectedBundle;
+    WKContextSetInjectedBundleClient(context, &injectedBundleClient);
+}
+
+static RetainPtr<SyntheticBackingScaleFactorWindow> createWindow()
+{
+    RetainPtr<SyntheticBackingScaleFactorWindow> window(AdoptNS, [[SyntheticBackingScaleFactorWindow alloc] initWithContentRect:NSMakeRect(0, 0, 800, 600) styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:YES]);
+    [window.get() setReleasedWhenClosed:NO];
+    return window;
+}
+
+TEST(WebKit2, GetBackingScaleFactor)
+{
+    WKRetainPtr<WKContextRef> context = adoptWK(Util::createContextForInjectedBundleTest("GetBackingScaleFactorTest"));
+    setInjectedBundleClient(context.get());
+    RetainPtr<WKView> view(AdoptNS, [[WKView alloc] initWithFrame:NSMakeRect(0, 0, 800, 600) contextRef:context.get() pageGroupRef:0]);
+
+    RetainPtr<SyntheticBackingScaleFactorWindow> window1 = createWindow();
+    [window1.get() setBackingScaleFactor:1];
+
+    [[window1.get() contentView] addSubview:view.get()];
+    WKContextPostMessageToInjectedBundle(context.get(), Util::toWK("GetBackingScaleFactor").get(), 0);
+    Util::run(&messageReceived);
+    messageReceived = false;
+    EXPECT_EQ(1, backingScaleFactor);
+
+    RetainPtr<SyntheticBackingScaleFactorWindow> window2 = createWindow();
+    [window2.get() setBackingScaleFactor:2];
+
+    [[window2.get() contentView] addSubview:view.get()];
+    WKContextPostMessageToInjectedBundle(context.get(), Util::toWK("GetBackingScaleFactor").get(), 0);
+    Util::run(&messageReceived);
+    messageReceived = false;
+    EXPECT_EQ(2, backingScaleFactor);
+
+    WKPageSetCustomBackingScaleFactor(view.get().pageRef, 3);
+    WKContextPostMessageToInjectedBundle(context.get(), Util::toWK("GetBackingScaleFactor").get(), 0);
+    Util::run(&messageReceived);
+    messageReceived = false;
+    EXPECT_EQ(3, backingScaleFactor);
+}
+
+} // namespace TestWebKitAPI