Add ui::GrabDesktopSnapshot for Windows.

ui/snapshot/snapshot.h

 // Copyright (c) 2012 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_H_
 #define UI_SNAPSHOT_SNAPSHOT_H_
 
 #include <vector>
 
 #include "ui/gfx/native_widget_types.h"
@@ skipping 11 matching lines @@
 SNAPSHOT_EXPORT bool GrabWindowSnapshot(
     gfx::NativeWindow window,
     std::vector<unsigned char>* png_representation,
     const gfx::Rect& snapshot_bounds);
 
 SNAPSHOT_EXPORT bool GrabViewSnapshot(
     gfx::NativeView view,
     std::vector<unsigned char>* png_representation,
     const gfx::Rect& snapshot_bounds);
 
+#if defined(OS_WIN)
+
+// Grabs a snapshot of the desktop. No security checks are done.  This is

[sky, 2013/04/16 22:06:49]

If this is for tests, why is it here and not in the test?

[grt (UTC plus 2), 2013/04/17 16:58:17]

Good point. I've moved GrabDesktopShortcut into a new test support lib
(snapshot_test_support). To avoid code duplication, it calls into its own
linked-in copy of the guts of the non-Aura GrabWindowSnapshot.

+// 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_EXPORT bool GrabDesktopSnapshot(
+    std::vector<unsigned char>* png_representation,
+    const gfx::Rect& snapshot_bounds);
+
+#endif  // defined(OS_WIN)
+
 }  // namespace ui
 
 #endif  // UI_SNAPSHOT_SNAPSHOT_H_