Extract some stuff into PackageManager

mojo/package_manager/package_manager_impl.h

+// 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.
+
+#ifndef MOJO_PACKAGE_MANAGER_PACKAGE_MANAGER_IMPL_H_
+#define MOJO_PACKAGE_MANAGER_PACKAGE_MANAGER_IMPL_H_
+
+#include "base/files/file_path.h"
+#include "mojo/fetcher/url_resolver.h"
+#include "mojo/services/network/public/interfaces/network_service.mojom.h"
+#include "mojo/services/network/public/interfaces/url_loader_factory.mojom.h"
+#include "mojo/shell/package_manager.h"
+
+namespace mojo {
+namespace shell {
+class Fetcher;
+}
+namespace package_manager {
+
+// This is the default implementation of shell::PackageManager. It loads
+// http/s urls off the network as well as providing special handling for mojo:
+// and about: urls.
+class PackageManagerImpl : public shell::PackageManager {
+ public:
+  // mojo: urls are only supported if |shell_file_root| is non-empty.
+  PackageManagerImpl(const base::FilePath& shell_file_root);

[yzshen1, 2015/09/16 23:47:20]

Please consider "explicit".

+  ~PackageManagerImpl() override;
+
+  // Register a content handler to handle content of |mime_type|.
+  void RegisterContentHandler(const std::string& mime_type,
+                              const GURL& content_handler_url);
+
+  // Registers a package alias. When attempting to load |alias|, it will
+  // instead redirect to |content_handler_package|, which is a content handler
+  // which will be passed the |alias| as the URLResponse::url. Different values
+  // of |alias| with the same |qualifier| that are in the same
+  // |content_handler_package| will run in the same process in multi-process
+  // mode.
+  void RegisterApplicationPackageAlias(
+      const GURL& alias,
+      const GURL& content_handler_package,
+      const std::string& qualifier);
+
+ private:
+  using ApplicationPackagedAlias = std::map<GURL, std::pair<GURL, std::string>>;
+  using MimeTypeToURLMap = std::map<std::string, GURL>;
+
+  // Overridden from shell::PackageManager:
+  void SetApplicationManager(shell::ApplicationManager* manager) override;
+  GURL ResolveURL(const GURL& url) override;
+  void FetchRequest(
+      URLRequestPtr request,
+      const shell::Fetcher::FetchCallback& loader_callback) override;
+  bool HandleWithContentHandler(shell::Fetcher* fetcher,
+                                const GURL& unresolved_url,
+                                base::TaskRunner* task_runner,
+                                URLResponsePtr* new_response,
+                                GURL* content_handler_url,
+                                std::string* qualifier) override;
+
+
+  shell::ApplicationManager* application_manager_;
+  scoped_ptr<fetcher::URLResolver> url_resolver_;
+  const bool disable_cache_;
+  NetworkServicePtr network_service_;
+  URLLoaderFactoryPtr url_loader_factory_;
+  ApplicationPackagedAlias application_package_alias_;
+  MimeTypeToURLMap mime_type_to_url_;
+
+  DISALLOW_COPY_AND_ASSIGN(PackageManagerImpl);
+};
+
+}  // namespace package_manager
+}  // namespace mojo
+
+#endif  // MOJO_PACKAGE_MANAGER_PACKAGE_MANAGER_IMPL_H_