add "always allow" option to the mediastream infobar and allow user to allow/not allow acces to devi

chrome/browser/content_settings/content_settings_policy_provider.cc

Index: chrome/browser/content_settings/content_settings_policy_provider.cc
diff --git a/chrome/browser/content_settings/content_settings_policy_provider.cc b/chrome/browser/content_settings/content_settings_policy_provider.cc
index f71bb4ca19f829fcd97a48019b6e801996caa294..50a84e3a0d86344c7a46a916f2375145012c4a42 100644
--- a/chrome/browser/content_settings/content_settings_policy_provider.cc
+++ b/chrome/browser/content_settings/content_settings_policy_provider.cc
@@ -35,6 +35,7 @@ const char* kPrefToManageType[CONTENT_SETTINGS_NUM_TYPES] = {
   NULL,  // No policy for default value of content type intents
   NULL,  // No policy for default value of content type auto-select-certificate
   NULL,  // No policy for default value of fullscreen requests
+  prefs::kManagedDefaultMediaStreamSetting,
 };
 
 struct PrefsForManagedContentSettingsMapEntry {
@@ -157,6 +158,9 @@ void PolicyProvider::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterIntegerPref(prefs::kManagedDefaultNotificationsSetting,
                              CONTENT_SETTING_DEFAULT,
                              PrefService::UNSYNCABLE_PREF);
+  prefs->RegisterIntegerPref(prefs::kManagedDefaultMediaStreamSetting,
+                             CONTENT_SETTING_DEFAULT,
+                             PrefService::UNSYNCABLE_PREF);
 }
 
 PolicyProvider::PolicyProvider(PrefService* prefs) : prefs_(prefs) {
@@ -194,6 +198,7 @@ PolicyProvider::PolicyProvider(PrefService* prefs) : prefs_(prefs) {
   pref_change_registrar_.Add(prefs::kManagedDefaultPopupsSetting, this);
   pref_change_registrar_.Add(prefs::kManagedDefaultGeolocationSetting, this);
   pref_change_registrar_.Add(prefs::kManagedDefaultNotificationsSetting, this);
+  pref_change_registrar_.Add(prefs::kManagedDefaultMediaStreamSetting, this);
 }
 
 PolicyProvider::~PolicyProvider() {
@@ -435,6 +440,8 @@ void PolicyProvider::Observe(int type,
       UpdateManagedDefaultSetting(CONTENT_SETTINGS_TYPE_GEOLOCATION);
     } else if (*name == prefs::kManagedDefaultNotificationsSetting) {
       UpdateManagedDefaultSetting(CONTENT_SETTINGS_TYPE_NOTIFICATIONS);
+    } else if (*name == prefs::kManagedDefaultMediaStreamSetting) {
+      UpdateManagedDefaultSetting(CONTENT_SETTINGS_TYPE_MEDIASTREAM);
     } else if (*name == prefs::kManagedAutoSelectCertificateForUrls ||
         *name == prefs::kManagedCookiesAllowedForUrls ||
         *name == prefs::kManagedCookiesBlockedForUrls ||