Make chrome.exe rendezvous with existing chrome process earlier.

chrome/browser/metro_utils/metro_chrome_win.h

+// Copyright 2013 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_METRO_UTILS_METRO_CHROME_WIN_H_
+#define CHROME_BROWSER_METRO_UTILS_METRO_CHROME_WIN_H_
+
+namespace chrome {
+
+// Using IApplicationActivationManager::ActivateApplication, activate the
+// Chrome window running in Metro mode. Returns true if the activation was
+// successful. Note that this can not be called nested in another COM
+// SendMessage (results in error RPC_E_CANTCALLOUT_ININPUTSYNCCALL), so use
+// PostTask to handle that case.
+bool ActivateMetroChrome();
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_METRO_UTILS_METRO_CHROME_WIN_H_