Implement two new policies to control muting the audio I/O.

chrome/common/pref_names.cc

 // 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.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 476 matching lines @@
 
 // An integer representing the state of the default apps installation process.
 // This value is persisted in the profile's user preferences because the process
 // is async, and the user may have stopped chrome in the middle.  The next time
 // the profile is opened, the process will continue from where it left off.
 //
 // See possible values in external_provider_impl.cc.
 const char kDefaultAppsInstallState[] = "default_apps_install_state";
 
 #if defined(OS_CHROMEOS)
-// An integer pref to initially mute volume if 1.
+// An integer pref to initially mute volume if 1. This pref is ignored if
+// |kAudioOutputAllowed| is set to false, but its value is preserved, therefore
+// when the policy is lifted the original mute state is restored.
 const char kAudioMute[] = "settings.audio.mute";
 
 // TODO(derat): This is deprecated in favor of |kAudioVolumePercent|; remove it
 // after R20 once we've cleared old user settings: http://crbug.com/112039
 const char kAudioVolumeDb[] = "settings.audio.volume";
 
 // A double pref storing the user-requested volume.
 const char kAudioVolumePercent[] = "settings.audio.volume_percent";
 
 // A boolean pref set to true if touchpad tap-to-click is enabled.
@@ skipping 1265 matching lines @@
 const char kDeviceLocation[] = "device_status.location";
 
 // A string that is used to store first-time sync startup after once sync is
 // disabled. This will be refreshed every sign-in.
 const char kSyncSpareBootstrapToken[] = "sync.spare_bootstrap_token";
 
 // A pref holding the value of the policy used to disable mounting of external
 // storage for the user.
 const char kExternalStorageDisabled[] = "hardware.external_storage_disabled";
 
+// A pref holding the value of the policy used to disable playing audio on
+// ChromeOS devices. This pref overrides |kAudioMute| but does not overwrite
+// it, therefore when the policy is lifted the original mute state is restored.
+const char kAudioOutputAllowed[] = "hardware.audio_output_enabled";
+
+// A pref holding the value of the policy used to disable capturing audio on
+// ChromeOS devices.
+const char kAudioCaptureAllowed[] = "hardware.audio_capture_enabled";
+
 // A dictionary that maps usernames to wallpaper properties.
 const char kUsersWallpaperInfo[] = "user_wallpaper_info";
 #endif
 
 // Whether there is a Flash version installed that supports clearing LSO data.
 const char kClearPluginLSODataEnabled[] = "browser.clear_lso_data_enabled";
 
 // Whether we should show Pepper Flash-specific settings.
 const char kPepperFlashSettingsEnabled[] =
     "browser.pepper_flash_settings_enabled";
@@ skipping 210 matching lines @@
 
 // Counts how many more times the 'profile on a network share' warning should be
 // shown to the user before the next silence period.
 const char kNetworkProfileWarningsLeft[] = "network_profile.warnings_left";
 // Tracks the time of the last shown warning. Used to reset
 // |network_profile.warnings_left| after a silence period.
 const char kNetworkProfileLastWarningTime[] =
     "network_profile.last_warning_time";
 
 }  // namespace prefs