Update cached kiosk app crx from usb stick.

chrome/browser/chromeos/extensions/external_cache.cc

 // Copyright (c) 2013 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/chromeos/extensions/external_cache.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/file_util.h"
@@ skipping 108 matching lines @@
   }
   UpdateExtensionLoader();
 }
 
 bool ExternalCache::GetExtension(const std::string& id,
                                  base::FilePath* file_path,
                                  std::string* version) {
   return local_cache_.GetExtension(id, file_path, version);
 }
 
+void ExternalCache::PutExternalExtension(
+    const std::string& id,
+    const base::FilePath& crx_file_path,
+    const std::string& version,
+    const PutExternalExtensionCallback& callback) {
+  local_cache_.PutExtension(id,
+                            crx_file_path,
+                            version,
+                            base::Bind(&ExternalCache::OnPutExternalExtension,
+                                       weak_ptr_factory_.GetWeakPtr(),
+                                       id,
+                                       callback));
+}
+
 void ExternalCache::Observe(int type,
                             const content::NotificationSource& source,
                             const content::NotificationDetails& details) {
   switch (type) {
     case extensions::NOTIFICATION_EXTENSION_INSTALL_ERROR: {
       extensions::CrxInstaller* installer =
           content::Source<extensions::CrxInstaller>(source).ptr();
       OnDamagedFileDetected(installer->source_file());
       break;
     }
@@ skipping 175 matching lines @@
   entry->SetString(extensions::ExternalProviderImpl::kExternalVersion, version);
   entry->SetString(extensions::ExternalProviderImpl::kExternalCrx,
                    file_path.value());
 
   cached_extensions_->Set(id, entry);
   if (delegate_)
     delegate_->OnExtensionLoadedInCache(id);
   UpdateExtensionLoader();
 }
 
+void ExternalCache::OnPutExternalExtension(
+    const std::string& id,
+    const PutExternalExtensionCallback& callback,
+    const base::FilePath& file_path,
+    bool file_ownership_passed) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  OnPutExtension(id, file_path, file_ownership_passed);
+  callback.Run(id, !file_ownership_passed);
+}
+
 std::string ExternalCache::Delegate::GetInstalledExtensionVersion(
     const std::string& id) {
   return std::string();
 }
 
 }  // namespace chromeos