Add management policy function allowing extensions to be disabled.

chrome/browser/extensions/installed_loader.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/installed_loader.h"
 
 #include "base/files/file_path.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 148 matching lines @@
       info.extension_id != extension->id()) {
     error = errors::kCannotChangeExtensionID;
     extension = NULL;
     content::RecordAction(UserMetricsAction("Extensions.IDChangedError"));
   }
 
   // Check policy on every load in case an extension was blacklisted while
   // Chrome was not running.
   const ManagementPolicy* policy = extensions::ExtensionSystem::Get(
       extension_service_->profile())->management_policy();
-  if (extension.get() && !policy->UserMayLoad(extension.get(), NULL)) {
-    // The error message from UserMayInstall() often contains the extension ID
-    // and is therefore not well suited to this UI.
-    error = errors::kDisabledByPolicy;
-    extension = NULL;
+  if (extension.get()) {
+    Extension::DisableReason disable_reason = Extension::DISABLE_NONE;
+    if (!policy->UserMayLoad(extension.get(), NULL)) {
+      // The error message from UserMayInstall() often contains the extension ID
+      // and is therefore not well suited to this UI.
+      error = errors::kDisabledByPolicy;
+      extension = NULL;
+    } else if (!extension_prefs_->IsExtensionDisabled(extension->id()) &&
+               policy->MustRemainDisabled(extension, &disable_reason, NULL)) {
+      extension_prefs_->SetExtensionState(extension->id(), Extension::DISABLED);
+      extension_prefs_->AddDisableReason(extension->id(), disable_reason);
+    }
   }
 
   if (!extension.get()) {
     extension_service_->ReportExtensionLoadError(
         info.extension_path, error, false);
     return;
   }
 
   if (write_to_prefs)
     extension_prefs_->UpdateManifest(extension.get());
@@ skipping 298 matching lines @@
 int InstalledLoader::GetCreationFlags(const ExtensionInfo* info) {
   int flags = extension_prefs_->GetCreationFlags(info->extension_id);
   if (!Manifest::IsUnpackedLocation(info->extension_location))
     flags |= Extension::REQUIRE_KEY;
   if (extension_prefs_->AllowFileAccess(info->extension_id))
     flags |= Extension::ALLOW_FILE_ACCESS;
   return flags;
 }
 
 }  // namespace extensions