Add content_settings::PolicyProvider and a set of new policies to managed content settings.

chrome/browser/content_settings/content_settings_base_provider.h

Index: chrome/browser/content_settings/content_settings_base_provider.h
diff --git a/chrome/browser/content_settings/content_settings_base_provider.h b/chrome/browser/content_settings/content_settings_base_provider.h
index d415e82da836bedd8d562096472a0b9dde899fc5..1e6c9e46dd78fe35824856341a14cadae98bdaed 100644
--- a/chrome/browser/content_settings/content_settings_base_provider.h
+++ b/chrome/browser/content_settings/content_settings_base_provider.h
@@ -84,6 +84,13 @@ class BaseProvider : public ProviderInterface {
   // CONTENT_SETTING_DEFAULT values.
   bool AllDefault(const ExtendedContentSettings& settings) const;
 
+  void UpdateContentSettingsMap(
+      const ContentSettingsPattern& requesting_pattern,
+      const ContentSettingsPattern& embedding_pattern,
+      ContentSettingsType content_type,
+      const ResourceIdentifier& resource_identifier,
+      ContentSetting content_setting);
+
   // TODO(markusheintz): LEGACY method. Will be removed in a future re-factoring
   // step.
   ContentSettings GetNonDefaultContentSettings(const GURL& url) const;