Add Application version and OS info in android about version page.

chrome/browser/ui/android/android_about_app_info.h

Index: chrome/browser/ui/android/android_about_app_info.h
diff --git a/chrome/browser/ui/android/android_about_app_info.h b/chrome/browser/ui/android/android_about_app_info.h
new file mode 100644
index 0000000000000000000000000000000000000000..3d8af98d7483182fecb659d53610e8c02e470cac
--- /dev/null
+++ b/chrome/browser/ui/android/android_about_app_info.h
@@ -0,0 +1,17 @@
+// 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_ANDROID_ANDROID_ABOUT_APP_INFO_H_
+#define CHROME_BROWSER_UI_ANDROID_ANDROID_ABOUT_APP_INFO_H_
+
+#include <string>
+
+namespace about_android_app {
+
+// Returns a string containing detailed info about the os environment.
+static std::string GetOsInfo();
+
+}  // namespace about_android_app
+
+#endif  // CHROME_BROWSER_UI_ANDROID_ANDROID_ABOUT_APP_INFO_H_