Add a method to classify what permission class an extension is in, with unit

chrome/common/extensions/extension.h

Index: chrome/common/extensions/extension.h
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index 7969e964713e21164fe4428d8f88c26f480ce124..1452014c4ac7308077d7c44fc46263b713af1157 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -62,6 +62,15 @@ class Extension {
   static const char* kPermissionNames[];
   static const size_t kNumPermissions;
 
+  // A classification of how dangerous an extension can be, based on what it has
+  // access to.
+  enum PermissionClass {
+    PERMISSION_CLASS_LOW = 0,  // green
+    PERMISSION_CLASS_MEDIUM,  // yellow
+    PERMISSION_CLASS_HIGH,  // orange
+    PERMISSION_CLASS_FULL,  // red
+  };
+
   // An NPAPI plugin included in the extension.
   struct PluginInfo {
     FilePath path;  // Path to the plugin.
@@ -205,6 +214,8 @@ class Extension {
   // the browser might load (like themes and page action icons).
   std::set<FilePath> GetBrowserImages();
 
+  PermissionClass GetPermissionClass();
+
 
   // Runtime data:
   // Put dynamic data about the state of a running extension below.