Add a preference for why an extension is disabled.

chrome/browser/extensions/extension_prefs.cc

Index: chrome/browser/extensions/extension_prefs.cc
diff --git a/chrome/browser/extensions/extension_prefs.cc b/chrome/browser/extensions/extension_prefs.cc
index 2c5dc80dedba1f11412b7935529e3c7af619c25d..4feb89f163bd2cbc46a2bbf2cf5f1522c11c3775 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -57,6 +57,9 @@ const char kPrefOrphanAcknowledged[] = "ack_orphan";
 // Indicates whether to show an install warning when the user enables.
 const char kExtensionDidEscalatePermissions[] = "install_warning_on_enable";
 
+// Indicates whether the extension was updated while it was disabled.
+const char kPrefDisableReason[] = "disable_reason";
+
 // A preference that tracks browser action toolbar configuration. This is a list
 // object stored in the Preferences file. The extensions are stored by ID.
 const char kExtensionToolbar[] = "extensions.toolbar";
@@ -673,6 +676,25 @@ void ExtensionPrefs::SetDidExtensionEscalatePermissions(
                       Value::CreateBooleanValue(did_escalate));
 }
 
+ExtensionPrefs::DisableReason ExtensionPrefs::GetDisableReason(
+    const std::string& extension_id) {
+  int value = -1;
+  if (ReadExtensionPrefInteger(extension_id, kPrefDisableReason, &value) &&
+      (value == DISABLE_UNKNOWN ||
+       value == DISABLE_USER_ACTION ||
+       value == DISABLE_PERMISSIONS_INCREASE ||
+       value == DISABLE_RELOAD))

[Aaron Boodman, 2012/04/09 20:30:48]

You could add a DISABLE_LAST to simplify this.

[Yoyo Zhou, 2012/04/10 01:57:36]

I guess so.

+    return static_cast<DisableReason>(value);
+  return DISABLE_UNKNOWN;
+}
+
+void ExtensionPrefs::SetDisableReason(const std::string& extension_id,
+                                      DisableReason disable_reason) {
+  UpdateExtensionPref(

[Aaron Boodman, 2012/04/09 20:30:48]

Consider removing the key in the case of UNKNOWN to save space.

[Yoyo Zhou, 2012/04/10 01:57:36]

Added a Remove* function.

+      extension_id, kPrefDisableReason,
+      Value::CreateIntegerValue(static_cast<int>(disable_reason)));
+}
+
 void ExtensionPrefs::UpdateBlacklist(
     const std::set<std::string>& blacklist_set) {
   std::vector<std::string> remove_pref_ids;