Add a preference for why an extension is disabled.

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 39c0360986c0bb44495280abafcfd12b16aa39e9..9382784af9ad5851f00fb48b51898203c2bef16e 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -71,6 +71,14 @@ class ExtensionPrefs : public ExtensionContentSettingsStore::Observer,
     LAUNCH_DEFAULT = LAUNCH_REGULAR
   };
 
+  // Used to record the reason an extension was disabled.
+  enum DisableReason {
+    DISABLE_UNKNOWN,
+    DISABLE_USER_ACTION,
+    DISABLE_PERMISSIONS_INCREASE,
+    DISABLE_RELOAD,
+  };
+
   // Does not assume ownership of |prefs| and |extension_pref_value_map|.
   // Note that you must call Init() to finalize construction.
   ExtensionPrefs(PrefService* prefs,
@@ -139,6 +147,11 @@ class ExtensionPrefs : public ExtensionContentSettingsStore::Observer,
   void SetDidExtensionEscalatePermissions(const Extension* extension,
                                           bool did_escalate);
 
+  // Getter and setter for disabled reason.
+  DisableReason GetDisableReason(const std::string& extension_id);
+  void SetDisableReason(const std::string& extension_id,
+                        DisableReason disable_reason);
+
   // Returns the version string for the currently installed extension, or
   // the empty string if not found.
   std::string GetVersionString(const std::string& extension_id);