Implement kiosk multiple apps feature.

chrome/browser/extensions/updater/chromeos_extension_cache_delegate.cc

 // Copyright 2015 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/updater/chromeos_extension_cache_delegate.h"
 
 #include <stddef.h>
 
+#include "base/path_service.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
+#include "chromeos/chromeos_paths.h"
 #include "chromeos/settings/cros_settings_names.h"
 
 namespace extensions {
-namespace {
 
-const char kLocalCacheDir[] = "/var/cache/external_cache";
-
-}  // namespace
-
-ChromeOSExtensionCacheDelegate::ChromeOSExtensionCacheDelegate()
-    : cache_dir_(kLocalCacheDir) {
+ChromeOSExtensionCacheDelegate::ChromeOSExtensionCacheDelegate() {
+  CHECK(PathService::Get(chromeos::DIR_DEVICE_EXTENSION_LOCAL_CACHE,
+                         &cache_dir_));
 }
 
 ChromeOSExtensionCacheDelegate::ChromeOSExtensionCacheDelegate(
     const base::FilePath& cache_dir)
     : cache_dir_(cache_dir) {
 }
 
 const base::FilePath& ChromeOSExtensionCacheDelegate::GetCacheDir() const {
   return cache_dir_;
 }
 
 size_t ChromeOSExtensionCacheDelegate::GetMaximumCacheSize() const {
   size_t max_size = ExtensionCacheDelegate::GetMaximumCacheSize();
   int policy_size = 0;
   if (chromeos::CrosSettings::Get()->GetInteger(chromeos::kExtensionCacheSize,
                                                 &policy_size) &&
       policy_size >= static_cast<int>(GetMinimumCacheSize())) {
     max_size = policy_size;
   }
   return max_size;
 }
 
 }  // namespace extensions