Policy: Re-enabled plugin still disabled

webkit/plugins/npapi/webplugininfo.h

Index: webkit/plugins/npapi/webplugininfo.h
diff --git a/webkit/plugins/npapi/webplugininfo.h b/webkit/plugins/npapi/webplugininfo.h
index 859665c1963614f0aa6b4ca3cf88b28c4c0fb4a0..a6c1914f4f54c1033416a88a6c7800fe191a0bf9 100644
--- a/webkit/plugins/npapi/webplugininfo.h
+++ b/webkit/plugins/npapi/webplugininfo.h
@@ -31,6 +31,32 @@ struct WebPluginMimeType {
 
 // Describes an available NPAPI plugin.
 struct WebPluginInfo {
+  // Defines the possible enabled state a plugin can have.
+  // The enum values actually represent a 3-bit bitfield :
+  // |PE|PD|U| - where |PE|PD| is policy state and U is user state.
+  //    PE == 1 means the plugin is forced to enabled state by policy
+  //    PD == 1 means the plugin is forced to disabled by policy
+  // PE and PD CAN'T be both 1 but can be both 0 which mean no policy is set.
+  //     U == 1 means the user has disabled the plugin.
+  // Because the plugin user state might have been changed before a policy was
+  // introduced the user state might contradict the policy state in which case
+  // the policy has precedence.
+  enum EnabledStates {
+    USER_ENABLED = 0,
+    USER_DISABLED = 1 << 0,
+    POLICY_DISABLED = 1 << 1,
+    POLICY_ENABLED = 1 << 2,
+    USER_ENABLED_POLICY_UNMANAGED = USER_ENABLED,
+    USER_ENABLED_POLICY_DISABLED = USER_ENABLED| POLICY_DISABLED,
+    USER_ENABLED_POLICY_ENABLED = USER_ENABLED | POLICY_ENABLED,
+    USER_DISABLED_POLICY_UNMANAGED = USER_DISABLED,
+    USER_DISABLED_POLICY_DISABLED = USER_DISABLED | POLICY_DISABLED,
+    USER_DISABLED_POLICY_ENABLED = USER_DISABLED | POLICY_ENABLED,
+    USER_MASK = USER_DISABLED,
+    MANAGED_MASK = POLICY_DISABLED | POLICY_ENABLED,
+    POLICY_UNMANAGED = -1
+  };
+
   WebPluginInfo();
   WebPluginInfo(const WebPluginInfo& rhs);
   ~WebPluginInfo();
@@ -57,10 +83,13 @@ struct WebPluginInfo {
   // A list of all the mime types that this plugin supports.
   std::vector<WebPluginMimeType> mime_types;
 
-  // Whether the plugin is enabled.
-  bool enabled;
+  // Enabled state of the plugin. See the EnabledStates enum.
+  int enabled;
 };
 
+// Checks wheter a plugin is enabled either by the user or by policy.
+bool IsPluginEnabled(const WebPluginInfo& plugin);
+
 }  // namespace npapi
 }  // namespace webkit