Upstream ChromeBrowserState sub-classes.

ios/chrome/browser/browser_state/test_chrome_browser_state_manager.cc

+// Copyright 2014 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 "ios/chrome/browser/browser_state/test_chrome_browser_state_manager.h"
+
+TestChromeBrowserStateManager::TestChromeBrowserStateManager(
+    const base::FilePath& user_data_dir)
+    : browser_state_info_cache_(local_state_.Get(), user_data_dir) {}
+
+TestChromeBrowserStateManager::~TestChromeBrowserStateManager() {}
+
+ios::ChromeBrowserState*
+TestChromeBrowserStateManager::GetLastUsedBrowserState() {
+  return nullptr;
+}
+
+ios::ChromeBrowserState* TestChromeBrowserStateManager::GetBrowserState(
+    const base::FilePath& path) {
+  return nullptr;
+}
+
+BrowserStateInfoCache*
+TestChromeBrowserStateManager::GetBrowserStateInfoCache() {
+  return &browser_state_info_cache_;
+}
+
+std::vector<ios::ChromeBrowserState*>
+TestChromeBrowserStateManager::GetLoadedBrowserStates() {
+  return std::vector<ios::ChromeBrowserState*>();
+}