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diff --git a/Source/WebKit2/Platform/mac/LayerHostingContext.mm b/Source/WebKit2/Platform/mac/LayerHostingContext.mm
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+++ b/Source/WebKit2/Platform/mac/LayerHostingContext.mm
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+/*
+ * Copyright (C) 2012 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 "LayerHostingContext.h"
+
+#import <WebCore/MachSendRight.h>
+#import <WebCore/QuartzCoreSPI.h>
+#import <WebKitSystemInterface.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+std::unique_ptr<LayerHostingContext> LayerHostingContext::createForPort(const MachSendRight& serverPort)
+{
+    auto layerHostingContext = std::make_unique<LayerHostingContext>();
+
+    layerHostingContext->m_layerHostingMode = LayerHostingMode::InProcess;
+    layerHostingContext->m_context = (CAContext *)WKCAContextMakeRemoteWithServerPort(serverPort.sendRight());
+
+    return layerHostingContext;
+}
+
+#if HAVE(OUT_OF_PROCESS_LAYER_HOSTING)
+std::unique_ptr<LayerHostingContext> LayerHostingContext::createForExternalHostingProcess()
+{
+    auto layerHostingContext = std::make_unique<LayerHostingContext>();
+    layerHostingContext->m_layerHostingMode = LayerHostingMode::OutOfProcess;
+
+#if PLATFORM(IOS)
+    // Use a very large display ID to ensure that the context is never put on-screen 
+    // without being explicitly parented. See <rdar://problem/16089267> for details.
+    layerHostingContext->m_context = [CAContext remoteContextWithOptions:@{
+        kCAContextIgnoresHitTest : @YES,
+        kCAContextDisplayId : @10000 }];
+#else
+    layerHostingContext->m_context = (CAContext *)WKCAContextMakeRemoteForWindowServer();
+#endif
+    
+    return layerHostingContext;
+}
+#endif
+
+LayerHostingContext::LayerHostingContext()
+{
+}
+
+LayerHostingContext::~LayerHostingContext()
+{
+}
+
+void LayerHostingContext::setRootLayer(CALayer *rootLayer)
+{
+    [m_context setLayer:rootLayer];
+}
+
+CALayer *LayerHostingContext::rootLayer() const
+{
+    return [m_context layer];
+}
+
+uint32_t LayerHostingContext::contextID() const
+{
+    return [m_context contextId];
+}
+
+void LayerHostingContext::invalidate()
+{
+    [m_context invalidate];
+}
+
+void LayerHostingContext::setColorSpace(CGColorSpaceRef colorSpace)
+{
+    [m_context setColorSpace:colorSpace];
+}
+
+CGColorSpaceRef LayerHostingContext::colorSpace() const
+{
+    return [m_context colorSpace];
+}
+
+#if PLATFORM(MAC) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101100
+void LayerHostingContext::setColorMatchUntaggedContent(bool colorMatchUntaggedContent)
+{
+    if ([m_context respondsToSelector:@selector(setColorMatchUntaggedContent:)])
+        [m_context setColorMatchUntaggedContent:colorMatchUntaggedContent];
+}
+
+bool LayerHostingContext::colorMatchUntaggedContent() const
+{
+    if ([m_context respondsToSelector:@selector(colorMatchUntaggedContent)])
+        return [m_context colorMatchUntaggedContent];
+    return false;
+}
+#endif
+
+#if HAVE(COREANIMATION_FENCES)
+void LayerHostingContext::setFencePort(mach_port_t fencePort)
+{
+    [m_context setFencePort:fencePort];
+}
+
+MachSendRight LayerHostingContext::createFencePort()
+{
+    return MachSendRight::adopt([m_context createFencePort]);
+}
+#else
+NO_RETURN_DUE_TO_ASSERT void LayerHostingContext::setFencePort(mach_port_t fencePort)
+{
+    ASSERT_NOT_REACHED();
+}
+
+NO_RETURN_DUE_TO_ASSERT MachSendRight LayerHostingContext::createFencePort()
+{
+    ASSERT_NOT_REACHED();
+#if ASSERT_DISABLED
+    return MachSendRight();
+#endif
+}
+#endif
+
+} // namespace WebKit