Adds method to invoke platform provided audio input UI.

media/audio/win/audio_manager_win.cc

 // Copyright (c) 2010 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.
 
 #include "media/audio/audio_io.h"
 
 #include <windows.h>
 #include <objbase.h>  // This has to be before initguid.h
 #include <initguid.h>
 #include <mmsystem.h>
 #include <setupapi.h>
 
 #include "base/basictypes.h"
+#include "base/command_line.h"
+#include "base/file_path.h"
+#include "base/path_service.h"
+#include "base/process_util.h"
 #include "base/scoped_ptr.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
+#include "base/win/windows_version.h"
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/fake_audio_output_stream.h"
 #include "media/audio/win/audio_manager_win.h"
 #include "media/audio/win/wavein_input_win.h"
 #include "media/audio/win/waveout_output_win.h"
 #include "media/base/limits.h"
 
 // Libraries required for the SetupAPI and Wbem APIs used here.
 #pragma comment(lib, "setupapi.lib")
 
@@ skipping 195 matching lines @@
 
     bool device_found = (device_interface_name == interface_detail->DevicePath);
 
     if (device_found)
       return GetDeviceAndDriverInfo(device_info, &device_data);
   }
 
   return string16();
 }
 
+bool AudioManagerWin::CanShowAudioInputSettings() {
+  return true;
+}
+
+void AudioManagerWin::ShowAudioInputSettings() {
+  std::wstring program;
+  std::string argument;
+  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+    program = L"sndvol32.exe";
+    argument = "-R";
+  } else {
+    program = L"control.exe";
+    argument = "mmsys.cpl,,1";
+  }
+
+  FilePath path;
+  PathService::Get(base::DIR_SYSTEM, &path);
+  path = path.Append(program);
+  CommandLine command_line(path);
+  command_line.AppendArg(argument);
+  base::LaunchApp(command_line, false, false, NULL);
+}
+
 // static
 AudioManager* AudioManager::CreateAudioManager() {
   return new AudioManagerWin();
 }