Linux: call xdg-open on downloaded files to open them.

chrome/common/platform_util.h

 // Copyright (c) 2009 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_COMMON_PLATFORM_UTIL_H_
 #define CHROME_COMMON_PLATFORM_UTIL_H_
 
 #include "base/gfx/native_widget_types.h"
 #include "base/string16.h"
 
 class FilePath;
 
 namespace platform_util {
 
 // Show the given file in a file manager. If possible, select the file.
 void ShowItemInFolder(const FilePath& full_path);
 
+// Open the given file in the desktop's default manner.
+void OpenItem(const FilePath& full_path);
+
 // Get the top level window for the native view. This can return NULL.
 gfx::NativeWindow GetTopLevel(gfx::NativeView view);
 
 // Get the title of the window.
 string16 GetWindowTitle(gfx::NativeWindow window);
 
 // Returns true if |window| is the foreground top level window.
 bool IsWindowActive(gfx::NativeWindow window);
 
 // Returns true if the view is visible. The exact definition of this is
 // platform-specific, but it is generally not "visible to the user", rather
 // whether the view has the visible attribute set.
 bool IsVisible(gfx::NativeView view);
 
 }
 
 #endif  // CHROME_COMMON_PLATFORM_UTIL_H_