Content settings extension API

chrome/browser/content_settings/host_content_settings_map.cc

Index: chrome/browser/content_settings/host_content_settings_map.cc
diff --git a/chrome/browser/content_settings/host_content_settings_map.cc b/chrome/browser/content_settings/host_content_settings_map.cc
index 5722d64546fc12797a01ed74db848e80672c451c..998af1a2c9231d1bc9481ee77b7ae3326c8d71de 100644
--- a/chrome/browser/content_settings/host_content_settings_map.cc
+++ b/chrome/browser/content_settings/host_content_settings_map.cc
@@ -294,6 +294,7 @@ void HostContentSettingsMap::GetSettingsForOneType(
 void HostContentSettingsMap::SetDefaultContentSetting(
     ContentSettingsType content_type,
     ContentSetting setting) {
+  DCHECK(IsSettingAllowedForType(content_type, setting));
   for (DefaultProviderIterator provider =
            default_content_settings_providers_.begin();
        provider != default_content_settings_providers_.end(); ++provider) {
@@ -306,6 +307,7 @@ void HostContentSettingsMap::SetContentSetting(
     ContentSettingsType content_type,
     const std::string& resource_identifier,
     ContentSetting setting) {
+  DCHECK(IsSettingAllowedForType(content_type, setting));
   for (ProviderIterator provider = content_settings_providers_.begin();
        provider != content_settings_providers_.end();
        ++provider) {
@@ -340,6 +342,34 @@ void HostContentSettingsMap::ClearSettingsForOneType(
   }
 }
 
+// static
+bool HostContentSettingsMap::IsSettingAllowedForType(
+    ContentSettingsType content_type, ContentSetting setting) {
+  // Prerendering doesn't have settings.
+  if (content_type == CONTENT_SETTINGS_TYPE_PRERENDER)
+    return false;
+
+  // For all other types, DEFAULT, ALLOW and BLOCK are always allowed.
+  if (setting == CONTENT_SETTING_DEFAULT ||
+      setting == CONTENT_SETTING_ALLOW ||
+      setting == CONTENT_SETTING_BLOCK) {
+    return true;
+  }
+  switch (content_type) {
+    case CONTENT_SETTINGS_TYPE_COOKIES:
+      return (setting == CONTENT_SETTING_SESSION_ONLY);
+    case CONTENT_SETTINGS_TYPE_PLUGINS:
+      return (setting == CONTENT_SETTING_ASK &&
+              CommandLine::ForCurrentProcess()->HasSwitch(
+                  switches::kEnableClickToPlay));
+    case CONTENT_SETTINGS_TYPE_GEOLOCATION:
+    case CONTENT_SETTINGS_TYPE_NOTIFICATIONS:
+      return (setting == CONTENT_SETTING_ASK);
+    default:
+      return false;
+  }
+}
+
 void HostContentSettingsMap::SetBlockThirdPartyCookies(bool block) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));