Refactor AO2TS to make it easier to componentize.

extensions/shell/browser/shell_oauth2_token_service_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 "extensions/shell/browser/shell_oauth2_token_service_delegate.h"
+
+#include <vector>
+
+namespace extensions {
+
+ShellOAuth2TokenServiceDelegate::ShellOAuth2TokenServiceDelegate(
+    content::BrowserContext* browser_context,
+    std::string account_id,
+    std::string refresh_token)
+    : browser_context_(browser_context),
+      account_id_(account_id),
+      refresh_token_(refresh_token) {
+}
+
+ShellOAuth2TokenServiceDelegate::~ShellOAuth2TokenServiceDelegate() {
+}
+
+bool ShellOAuth2TokenServiceDelegate::RefreshTokenIsAvailable(
+    const std::string& account_id) const {
+  if (account_id != account_id_)
+    return false;
+
+  return !refresh_token_.empty();
+}
+
+OAuth2AccessTokenFetcher*
+ShellOAuth2TokenServiceDelegate::CreateAccessTokenFetcher(
+    const std::string& account_id,
+    net::URLRequestContextGetter* getter,
+    OAuth2AccessTokenConsumer* consumer) {
+  DCHECK_EQ(account_id, account_id_);
+  DCHECK(!refresh_token_.empty());
+  return new OAuth2AccessTokenFetcherImpl(consumer, getter, refresh_token_);
+}
+
+net::URLRequestContextGetter*
+ShellOAuth2TokenServiceDelegate::GetRequestContext() const {
+  return browser_context_->GetRequestContext();
+}
+
+std::vector<std::string> ShellOAuth2TokenServiceDelegate::GetAccounts() {
+  std::vector<std::string> accounts;
+  accounts.push_back(account_id_);
+  return accounts;
+}
+
+void ShellOAuth2TokenServiceDelegate::UpdateCredentials(
+    const std::string& account_id,
+    const std::string& refresh_token) {
+  account_id_ = account_id;
+  refresh_token_ = refresh_token;
+}
+
+}  // namespace extensions