Enforce the 'requirements' field in manifests.

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 dbbbf8d4115408fe03d568fca98e441d763afe32..3a8a7b24fc621df4a0a7d017979652c3448e5222 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -63,6 +63,9 @@ const char kPrefOrphanAcknowledged[] = "ack_orphan";
 // Indicates whether to show an install warning when the user enables.
 const char kExtensionDidEscalatePermissions[] = "install_warning_on_enable";
 
+// Any errors that arose from unmet unmet requirements.
+const char kUnsupportedRequirements[] = "unsupported_requirements";
+
 // Indicates whether the extension was updated while it was disabled.
 const char kPrefDisableReason[] = "disable_reason";
 
@@ -624,7 +627,7 @@ bool ExtensionPrefs::IsAppNotificationDisabled(
 }
 
 void ExtensionPrefs::SetAppNotificationDisabled(
-   const std::string& extension_id, bool value) {
+    const std::string& extension_id, bool value) {
   DCHECK(Extension::IdIsValid(extension_id));
   UpdateExtensionPref(extension_id, kPrefAppNotificationDisbaled,
                       Value::CreateBooleanValue(value));
@@ -641,7 +644,6 @@ std::string ExtensionPrefs::GetDebugPolicyProviderName() const {
 
 bool ExtensionPrefs::UserMayLoad(const Extension* extension,
                                  string16* error) const {
-
   const base::ListValue* blacklist =
       prefs_->GetList(prefs::kExtensionInstallDenyList);
   const base::ListValue* whitelist =
@@ -677,6 +679,48 @@ void ExtensionPrefs::SetDidExtensionEscalatePermissions(
                       Value::CreateBooleanValue(did_escalate));
 }
 
+bool ExtensionPrefs::HasUnsupportedRequirements(
+    const std::string& extension_id) {
+  const ListValue* requirement_errors = NULL;
+  return ReadExtensionPrefList(extension_id,
+                               kUnsupportedRequirements,
+                               &requirement_errors);
+}
+
+void ExtensionPrefs::ClearUnsupportedRequirements(
+    const std::string& extension_id) {
+  UpdateExtensionPref(extension_id, kUnsupportedRequirements, NULL);
+}
+
+void ExtensionPrefs::SetUnsupportedRequirements(
+    const std::string& extension_id,
+    std::vector<std::string> requirement_errors) {
+  ListValue* errors_list = new ListValue();
+  std::vector<std::string>::iterator it;
+  for (it = requirement_errors.begin(); it != requirement_errors.end(); ++it)
+    errors_list->Append(Value::CreateStringValue(*it));
+  UpdateExtensionPref(extension_id, kUnsupportedRequirements, errors_list);
+}
+
+std::vector<std::string> ExtensionPrefs::GetUnsupportedRequirements(
+    const std::string& extension_id) {
+  std::vector<std::string> requirement_errors;
+  const DictionaryValue* extension = GetExtensionPref(extension_id);
+  if (!extension)
+    return requirement_errors;
+
+  ListValue* value = NULL;
+  if (!extension->GetList(kUnsupportedRequirements, &value))
+    return requirement_errors;
+
+  for (size_t i = 0; i < value->GetSize(); ++i) {
+    std::string error;
+    if (value->GetString(i, &error))
+      requirement_errors.push_back(error);
+  }
+  return requirement_errors;
+}
+
 Extension::DisableReason ExtensionPrefs::GetDisableReason(
     const std::string& extension_id) {
   int value = -1;
@@ -833,7 +877,6 @@ void ExtensionPrefs::MigratePermissions(const ExtensionIdSet& extension_ids) {
   PermissionsInfo* info = PermissionsInfo::GetInstance();
   for (ExtensionIdSet::const_iterator ext_id =
        extension_ids.begin(); ext_id != extension_ids.end(); ++ext_id) {
-
     // An extension's granted permissions need to be migrated if the
     // full_access bit is present. This bit was always present in the previous
     // scheme and is never present now.