Load the metro driver dll at startup

When the metro_driver is present, we need to relinquish the browser main
thread to it, execution of chrome will continue on another thread, which
will be used as chrome main thread.

TEST=none, other that chrome should work.
BUG=118641
Review URL: https://chromiumcodereview.appspot.com/9718001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@127714 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 33 insertions, 0 deletions

diff --git a/chrome/app/metro_driver_win.h b/chrome/app/metro_driver_win.h
new file mode 100644
index 0000000..b99a9af
--- /dev/null
+++ b/chrome/app/metro_driver_win.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2011 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_APP_METRO_DRIVER_WIN_H_
+#define CHROME_APP_METRO_DRIVER_WIN_H_
+
+#include <Windows.h>
+
+// Helper class to manage the metro driver dll. When present in the system,
+// the main process thread needs to call InitMetro(), normal execution of
+// chrome initialization will continue on a second thread while the main
+// thread will be servicing the metro message loop.
+class MetroDriver {
+ public:
+  typedef int (*MainFn)(HINSTANCE instance);
+
+  MetroDriver();
+  // returns true if chrome is being launched in metro. If so we should
+  // call RunInMetro(). If not then we should just run chrome as usual.
+  bool in_metro_mode() const {  return (NULL != init_metro_fn_); }
+
+  // Enter the metro main function, which will only return when chrome metro
+  // is closed. Once metro has initialized, the dll creates a new thread
+  // which runs |main_fn|. This method returns when the chrome metro session
+  // is closed by the user.
+  int RunInMetro(HINSTANCE instance, MainFn main_fn);
+
+ private:
+  void* init_metro_fn_;
+};
+
+#endif  // CHROME_APP_METRO_DRIVER_WIN_H_