Added a missing file related to WinRT power management/reporting.

src/power/winrt/SDL_syspower.cpp

@@ -0,0 +1,44 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_POWER_DISABLED
+#if SDL_POWER_WINRT
+
+#include "SDL_power.h"
+
+extern "C"
+SDL_bool
+SDL_GetPowerInfo_WinRT(SDL_PowerState * state, int *seconds, int *percent)
+{
+    /* TODO, WinRT: Battery info is available on at least one WinRT platform (Windows Phone 8).  Implement SDL_GetPowerInfo_WinRT as appropriate. */
+    /* Notes:
+         - the Win32 function, GetSystemPowerStatus, is not available for use on WinRT
+         - Windows Phone 8 has a 'Battery' class, which is documented as available for C++
+             - More info on WP8's Battery class can be found at http://msdn.microsoft.com/library/windowsphone/develop/jj207231
+    */
+    return SDL_FALSE;
+}
+
+#endif /* SDL_POWER_WINRT */
+#endif /* SDL_POWER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */