Send WM_DEVICECHANGE message through SystemMonitor

WM_DEVICECHANGE is sent when there's been a change to devices or the computer;
specifically when a USB device is connected or disconnected. This is intended
for use in support of Gamepads for more performant polling and
connect/disconnect testing. Currently only on Windows, though seems reasonable
to add for other platforms in the future.

BUG=79050


Review URL: http://codereview.chromium.org/8523021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109960 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/content/browser/system_message_window_win.h b/content/browser/system_message_window_win.h
new file mode 100644
index 0000000..184aaa3
--- /dev/null
+++ b/content/browser/system_message_window_win.h
@@ -0,0 +1,43 @@
+// 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 CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_
+#define CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_
+#pragma once
+
+#include "build/build_config.h"
+
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+
+class CONTENT_EXPORT SystemMessageWindowWin {
+ public:
+  SystemMessageWindowWin();
+  virtual ~SystemMessageWindowWin();
+
+  virtual LRESULT OnDeviceChange(UINT event_type, DWORD data);
+
+ private:
+  LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
+                           WPARAM wparam, LPARAM lparam);
+
+  static LRESULT CALLBACK WndProcThunk(HWND hwnd,
+                                       UINT message,
+                                       WPARAM wparam,
+                                       LPARAM lparam) {
+    SystemMessageWindowWin* msg_wnd = reinterpret_cast<SystemMessageWindowWin*>(
+        GetWindowLongPtr(hwnd, GWLP_USERDATA));
+    if (msg_wnd)
+      return msg_wnd->WndProc(hwnd, message, wparam, lparam);
+    return ::DefWindowProc(hwnd, message, wparam, lparam);
+  }
+
+  HWND window_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemMessageWindowWin);
+};
+
+#endif  // CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_