Integrate the Windows 8 code into the Chromium tree.

win8/metro_driver/secondary_tile.h

Index: win8/metro_driver/secondary_tile.h
diff --git a/win8/metro_driver/secondary_tile.h b/win8/metro_driver/secondary_tile.h
new file mode 100644
index 0000000000000000000000000000000000000000..796e881fa0e6a2d466282ec2ee38826d43b0aa8f
--- /dev/null
+++ b/win8/metro_driver/secondary_tile.h
@@ -0,0 +1,16 @@
+// 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 CHROME_BROWSER_UI_METRO_DRIVER_SECONDARY_TILE_H_
+#define CHROME_BROWSER_UI_METRO_DRIVER_SECONDARY_TILE_H_
+
+#include "base/string16.h"
+
+extern "C" __declspec(dllexport)
+BOOL MetroIsPinnedToStartScreen(const string16& url);
+
+extern "C" __declspec(dllexport)
+void MetroTogglePinnedToStartScreen(const string16& title, const string16& url);
+
+#endif  // CHROME_BROWSER_UI_METRO_DRIVER_SECONDARY_TILE_H_
+