SkLeanWindows.h: #include "Windows.h" fewer places

include/private/SkLeanWindows.h

Index: include/private/SkLeanWindows.h
diff --git a/include/private/SkLeanWindows.h b/include/private/SkLeanWindows.h
new file mode 100644
index 0000000000000000000000000000000000000000..2bdddbba390e3dcda4a35f6f09608431ec2617e5
--- /dev/null
+++ b/include/private/SkLeanWindows.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkLeanWindows_DEFINED
+#define SkLeanWindows_DEFINED
+
+#include "SkTypes.h"
+
+#ifdef SK_BUILD_FOR_WIN
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#    define WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
+#  endif
+#  ifndef NOMINMAX
+#    define NOMINMAX
+#    define NOMINMAX_WAS_LOCALLY_DEFINED
+#  endif
+#
+#  include <windows.h>
+#
+#  ifdef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
+#    undef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
+#    undef WIN32_LEAN_AND_MEAN
+#  endif
+#  ifdef NOMINMAX_WAS_LOCALLY_DEFINED
+#    undef NOMINMAX_WAS_LOCALLY_DEFINED
+#    undef NOMINMAX
+#  endif
+#endif
+
+#endif  // SkLeanWindows_DEFINED