Use PrintWindow() to implement snapshots on windows 8.1+

ui/snapshot/snapshot_win.h

Index: ui/snapshot/snapshot_win.h
diff --git a/ui/snapshot/snapshot_win.h b/ui/snapshot/snapshot_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..351d8d898bd0b269dd4e211cd3992c76eb0e49ad
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+++ b/ui/snapshot/snapshot_win.h
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+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_SNAPSHOT_SNAPSHOT_WIN_H_
+#define UI_SNAPSHOT_SNAPSHOT_WIN_H_
+
+#include <windows.h>
+
+#include "ui/snapshot/snapshot_export.h"
+
+namespace gfx {
+class Image;
+class Rect;
+}
+
+namespace ui {
+namespace internal {
+
+// Grabs a snapshot of the desktop. No security checks are done.  This is
+// intended to be used for debugging purposes where no BrowserProcess instance
+// is available (ie. tests). DO NOT use in a result of user action.
+//
+// snapshot_bounds_in_pixels is the area relative to clip_rect_in_pixels that
+// should be captured.  Areas outside clip_rect_in_pixels are filled white.
+// clip_rect_in_pixels is relative to the client area of the window.
+SNAPSHOT_EXPORT bool GrabHwndSnapshot(
+    HWND window_handle,
+    const gfx::Rect& snapshot_bounds_in_pixels,
+    const gfx::Rect& clip_rect_in_pixels,
+    gfx::Image* image);
+
+}  // namespace internal
+}  // namespace ui
+
+#endif  // UI_SNAPSHOT_SNAPSHOT_WIN_H_