Reland r101269: Store plug-in enabled/disabled state in PluginPrefs instead of WebPluginInfo.

chrome/browser/plugin_prefs.h

Index: chrome/browser/plugin_prefs.h
diff --git a/chrome/browser/plugin_prefs.h b/chrome/browser/plugin_prefs.h
index d55a6000c15fae5a1cb57b1d7cd8b33b6fd1d13b..ecfd5856190fbdb1d745049f6d40dd7726afa162 100644
--- a/chrome/browser/plugin_prefs.h
+++ b/chrome/browser/plugin_prefs.h
@@ -6,12 +6,14 @@
 #define CHROME_BROWSER_PLUGIN_PREFS_H_
 #pragma once
 
+#include <map>
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/synchronization/lock.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/common/notification_observer.h"
 
@@ -37,11 +39,16 @@ class PluginGroup;
 
 // This class stores information about whether a plug-in or a plug-in group is
 // enabled or disabled.
-// Except for the |IsPluginEnabled| method, it should only be used on the UI
-// thread.
+// Except where otherwise noted, it can be used on every thread.
 class PluginPrefs : public base::RefCountedThreadSafe<PluginPrefs>,
                     public NotificationObserver {
  public:
+  enum PolicyStatus {
+    NO_POLICY = 0,  // Neither enabled or disabled by policy.
+    POLICY_ENABLED,
+    POLICY_DISABLED,
+  };
+
   // Initializes the factory for this class for dependency tracking.
   // This should be called before the first profile is created.
   static void Initialize();
@@ -49,77 +56,96 @@ class PluginPrefs : public base::RefCountedThreadSafe<PluginPrefs>,
   // Returns the instance associated with |profile|, creating it if necessary.
   static PluginPrefs* GetForProfile(Profile* profile);
 
+  // Usually the PluginPrefs associated with a TestingProfile is NULL.
+  // This method overrides that for a given TestingProfile, returning the newly
+  // created PluginPrefs object.
+  static PluginPrefs* GetForTestingProfile(Profile* profile);
+
   // Creates a new instance. This method should only be used for testing.
   PluginPrefs();
 
   // Associates this instance with |prefs|. This enables or disables
   // plugin groups as defined by the user's preferences.
+  // This method should only be called on the UI thread.
   void SetPrefs(PrefService* prefs);
 
+  // Detaches from the PrefService before it is destroyed.
+  // As the name says, this method should only be called on the UI thread.
+  void ShutdownOnUIThread();
+
   // Enable or disable a plugin group.
   void EnablePluginGroup(bool enable, const string16& group_name);
 
   // Enable or disable a specific plugin file.
   void EnablePlugin(bool enable, const FilePath& file_path);
 
+  // Enable or disable a plug-in in all profiles. This sets a default for
+  // profiles which are created later as well.
+  // This method should only be called on the UI thread.
+  static void EnablePluginGlobally(bool enable, const FilePath& file_path);
+
+  // Returns whether there is a policy enabling or disabling plug-ins of the
+  // given name.
+  PolicyStatus PolicyStatusForPlugin(const string16& name);
+
   // Returns whether the plugin is enabled or not.
   bool IsPluginEnabled(const webkit::WebPluginInfo& plugin);
 
-  // Write the enable/disable status to the user's preference file.
-  void UpdatePreferences(int delay_ms);
+  // Registers the preferences used by this class.
+  // This method should only be called on the UI thread.
+  static void RegisterPrefs(PrefService* prefs);
 
-  // NotificationObserver method overrides
+  // NotificationObserver method override.
   virtual void Observe(int type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
-
-  static void RegisterPrefs(PrefService* prefs);
-
-  void ShutdownOnUIThread();
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   friend class base::RefCountedThreadSafe<PluginPrefs>;
+  friend class PluginPrefsTest;
 
   class Factory;
 
   virtual ~PluginPrefs();
 
+  // Allows unit tests to directly set enforced plug-in patterns.
+  void SetPolicyEnforcedPluginPatterns(
+      const std::set<string16>& disabled_patterns,
+      const std::set<string16>& disabled_exception_patterns,
+      const std::set<string16>& enabled_patterns);
+
   // Called on the file thread to get the data necessary to update the saved
   // preferences.
   void GetPreferencesDataOnFileThread();
 
   // Called on the UI thread with the plugin data to save the preferences.
-  void OnUpdatePreferences(std::vector<webkit::WebPluginInfo> plugins,
-                           std::vector<webkit::npapi::PluginGroup> groups);
+  void OnUpdatePreferences(std::vector<webkit::npapi::PluginGroup> groups);
 
-  // Queues sending the notification that plugin data has changed.  This is done
-  // so that if a bunch of changes happen, we only send one notification.
+  // Sends the notification that plugin data has changed.
   void NotifyPluginStatusChanged();
 
-  // Used for the post task to notify that plugin enabled status changed.
-  void OnNotifyPluginStatusChanged();
+  static void ListValueToStringSet(const base::ListValue* src,
+                                   std::set<string16>* dest);
+
+  // Checks if |name| matches any of the patterns in |pattern_set|.
+  static bool IsStringMatchedInSet(const string16& name,
+                                   const std::set<string16>& pattern_set);
 
-  base::DictionaryValue* CreatePluginFileSummary(
-      const webkit::WebPluginInfo& plugin);
+  // Guards access to the following data structures.
+  mutable base::Lock lock_;
 
-  // Force plugins to be enabled or disabled due to policy.
-  // |disabled_list| contains the list of StringValues of the names of the
-  // policy-disabled plugins, |exceptions_list| the policy-allowed plugins,
-  // and |enabled_list| the policy-enabled plugins.
-  void UpdatePluginsStateFromPolicy(const base::ListValue* disabled_list,
-                                    const base::ListValue* exceptions_list,
-                                    const base::ListValue* enabled_list);
+  std::map<FilePath, bool> plugin_state_;
+  std::map<string16, bool> plugin_group_state_;
 
-  void ListValueToStringSet(const base::ListValue* src,
-                            std::set<string16>* dest);
+  std::set<string16> policy_disabled_plugin_patterns_;
+  std::set<string16> policy_disabled_plugin_exception_patterns_;
+  std::set<string16> policy_enabled_plugin_patterns_;
 
-  // Weak pointer, owned by the profile.
+  // Weak pointer, owned by the profile (which owns us).
   PrefService* prefs_;
 
   PrefChangeRegistrar registrar_;
 
-  bool notify_pending_;
-
   DISALLOW_COPY_AND_ASSIGN(PluginPrefs);
 };