Add a global on/off switch for content settings and expose a toggle on the Website Settings options…

chrome/browser/content_settings/host_content_settings_map.h

 // 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.
 
 // Maps hostnames to custom content settings.  Written on the UI thread and read
 // on any thread.  One instance per profile.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/threading/platform_thread.h"
 #include "base/tuple.h"
 #include "chrome/browser/content_settings/content_settings_observer.h"
+#include "chrome/browser/content_settings/content_settings_override_provider.h"
 #include "chrome/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
 class ExtensionService;
 class GURL;
 class PrefService;
 
 namespace base {
 class Clock;
 class Value;
 }
 
 namespace content_settings {
+class OverrideProvider;
 class ProviderInterface;
 class PrefProvider;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 class HostContentSettingsMap
     : public content_settings::Observer,
       public base::RefCountedThreadSafe<HostContentSettingsMap> {
  public:
   enum ProviderType {
     INTERNAL_EXTENSION_PROVIDER = 0,
     POLICY_PROVIDER,
     CUSTOM_EXTENSION_PROVIDER,
+    OVERRIDE_PROVIDER,
     PREF_PROVIDER,
     DEFAULT_PROVIDER,
     NUM_PROVIDER_TYPES,
   };
 
   HostContentSettingsMap(PrefService* prefs, bool incognito);
 
 #if defined(ENABLE_EXTENSIONS)
   // In some cases, the ExtensionService is not available at the time the
   // HostContentSettingsMap is constructed. In these cases, we register the
@@ skipping 28 matching lines @@
   // If |info| is not NULL, then the |source| field of |info| is set to the
   // source of the returned |Value| (POLICY, EXTENSION, USER, ...) and the
   // |primary_pattern| and the |secondary_pattern| fields of |info| are set to
   // the patterns of the applying rule.  Note that certain internal schemes are
   // whitelisted. For whitelisted schemes the |source| field of |info| is set
   // the |SETTING_SOURCE_WHITELIST| and the |primary_pattern| and
   // |secondary_pattern| are set to a wildcard pattern.  If there is no content
   // setting, NULL is returned and the |source| field of |info| is set to
   // |SETTING_SOURCE_NONE|. The pattern fiels of |info| are set to empty
   // patterns.
-  // The ownership of the resulting |Value| is transfered to the caller.
   // May be called on any thread.
-  base::Value* GetWebsiteSetting(
+  scoped_ptr<base::Value> GetWebsiteSetting(
       const GURL& primary_url,
       const GURL& secondary_url,
       ContentSettingsType content_type,
       const std::string& resource_identifier,
       content_settings::SettingInfo* info) const;
 
   // For a given content type, returns all patterns with a non-default setting,
   // mapped to their actual settings, in the precedence order of the rules.
   // |settings| must be a non-NULL outparam.
   //
@@ skipping 128 matching lines @@
                           const GURL& secondary_url,
                           ContentSettingsType content_type);
 
   // Returns the last time the pattern has requested permission for the
   // |content_type| setting.
   base::Time GetLastUsageByPattern(
       const ContentSettingsPattern& primary_pattern,
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type);
 
+  // Returns the content setting without considering the global on/off toggle
+  // for the content setting that matches the URLs.
+  ContentSetting GetContentSettingWithoutOverride(
+      const GURL& primary_url,
+      const GURL& secondary_url,
+      ContentSettingsType content_type,
+      const std::string& resource_identifier);
+
+  // Returns the single content setting |value| without considering the
+  // global on/off toggle for the content setting that matches the given
+  // patterns.
+  scoped_ptr<base::Value> GetWebsiteSettingWithoutOverride(
+      const GURL& primary_url,
+      const GURL& secondary_url,
+      ContentSettingsType content_type,
+      const std::string& resource_identifier,
+      content_settings::SettingInfo* info) const;
+
+  // Sets globally if a given |content_type| |is_enabled|.
+  void SetContentSettingOverride(ContentSettingsType content_type,
+                                 bool is_enabled);
+
+  // Returns if a given |content_type| is enabled.
+  bool GetContentSettingOverride(ContentSettingsType content_type);
+
   // Adds/removes an observer for content settings changes.
   void AddObserver(content_settings::Observer* observer);
   void RemoveObserver(content_settings::Observer* observer);
 
   // Passes ownership of |clock|.
   void SetPrefClockForTesting(scoped_ptr<base::Clock> clock);
 
  private:
   friend class base::RefCountedThreadSafe<HostContentSettingsMap>;
   friend class HostContentSettingsMapTest_NonDefaultSettings_Test;
@@ skipping 24 matching lines @@
       const std::string& resource_identifier,
       ContentSettingsForOneType* settings,
       bool incognito) const;
 
   // Call UsedContentSettingsProviders() whenever you access
   // content_settings_providers_ (apart from initialization and
   // teardown), so that we can DCHECK in RegisterExtensionService that
   // it is not being called too late.
   void UsedContentSettingsProviders() const;
 
+  // Returns the single content setting |value| with a toggle for if it
+  // takes the global on/off switch into account.
+  scoped_ptr<base::Value> GetWebsiteSettingInternal(
+      const GURL& primary_url,
+      const GURL& secondary_url,
+      ContentSettingsType content_type,
+      const std::string& resource_identifier,
+      content_settings::SettingInfo* info,
+      bool get_override) const;
+
   content_settings::PrefProvider* GetPrefProvider();
 
 #ifndef NDEBUG
   // This starts as the thread ID of the thread that constructs this
   // object, and remains until used by a different thread, at which
   // point it is set to base::kInvalidThreadId. This allows us to
   // DCHECK on unsafe usage of content_settings_providers_ (they
   // should be set up on a single thread, after which they are
   // immutable).
   mutable base::PlatformThreadId used_from_thread_id_;
 #endif
 
   // Weak; owned by the Profile.
   PrefService* prefs_;
 
   // Whether this settings map is for an OTR session.
   bool is_off_the_record_;
 
   // Content setting providers. This is only modified at construction
   // time and by RegisterExtensionService, both of which should happen
   // before any other uses of it.
   ProviderMap content_settings_providers_;
 
   ObserverList<content_settings::Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(HostContentSettingsMap);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_