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

chrome/browser/content_settings/content_settings_provider.h

 // Copyright (c) 2011 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.
 
 // Interface for objects providing content setting rules.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #pragma once
 
@@ skipping 47 matching lines @@
 
     ContentSettingsPattern requesting_url_pattern;
     ContentSettingsPattern embedding_url_pattern;
     ContentSetting content_setting;
   };
 
   typedef std::vector<Rule> Rules;
 
   virtual ~ProviderInterface() {}
 
+  // Returns true whether the content settings provider manages the
+  // |content_type|.
+  virtual bool ContentSettingsTypeIsManaged(
+      ContentSettingsType content_type) = 0;
+
   // Returns a single ContentSetting which applies to a given |requesting_url|,
   // |embedding_url| pair or CONTENT_SETTING_DEFAULT, if no rule applies. For
   // ContentSettingsTypes that require a resource identifier to be specified,
   // the |resource_identifier| must be non-empty.
   //
   // This may be called on any thread.
   virtual ContentSetting GetContentSetting(
       const GURL& requesting_url,
       const GURL& embedding_url,
       ContentSettingsType content_type,
@@ skipping 37 matching lines @@
 
   // Resets all content settings to CONTENT_SETTINGS_DEFAULT.
   //
   // This should only be called on the UI thread.
   virtual void ResetToDefaults() = 0;
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_