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diff --git a/gfx/angle/include/angle_windowsstore.h b/gfx/angle/include/angle_windowsstore.h
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+++ b/gfx/angle/include/angle_windowsstore.h
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+//
+// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// angle_windowsstore.h:
+
+#ifndef ANGLE_WINDOWSSTORE_H_
+#define ANGLE_WINDOWSSTORE_H_
+
+// The following properties can be set on the CoreApplication to support additional
+// ANGLE configuration options.
+//
+// The Visual Studio sample templates provided with this version of ANGLE have examples
+// of how to set these property values.
+
+//
+// Property: EGLNativeWindowTypeProperty
+// Type: IInspectable
+// Description: Set this property to specify the window type to use for creating a surface.
+//              If this property is missing, surface creation will fail.
+//
+const wchar_t EGLNativeWindowTypeProperty[] = L"EGLNativeWindowTypeProperty";
+
+//
+// Property: EGLRenderSurfaceSizeProperty
+// Type: Size
+// Description: Set this property to specify a preferred size in pixels of the render surface.
+//              The render surface size width and height must be greater than 0.
+//              If this property is set, then the render surface size is fixed.
+//              The render surface will then be scaled to the window dimensions.
+//              If this property is missing, a default behavior will be provided.
+//              The default behavior uses the window size if a CoreWindow is specified or
+//              the size of the SwapChainPanel control if one is specified.
+//
+const wchar_t EGLRenderSurfaceSizeProperty[] = L"EGLRenderSurfaceSizeProperty";
+
+//
+// Property: EGLRenderResolutionScaleProperty
+// Type: Single
+// Description: Use this to specify a preferred scale for the render surface compared to the window.
+//              For example, if the window is 800x480, and:
+//                - scale is set to 0.5f then the surface will be 400x240
+//                - scale is set to 1.2f then the surface will be 960x576
+//              If the window resizes or rotates then the surface will resize accordingly.
+//              EGLRenderResolutionScaleProperty and EGLRenderSurfaceSizeProperty cannot both be set.
+//              The scale factor should be > 0.0f.
+//
+const wchar_t EGLRenderResolutionScaleProperty[] = L"EGLRenderResolutionScaleProperty";
+
+#endif // ANGLE_WINDOWSSTORE_H_