Extract some stuff into PackageManager

mojo/shell/test_package_manager.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_SHELL_TEST_PACKAGE_MANAGER_H_
+#define MOJO_SHELL_TEST_PACKAGE_MANAGER_H_
+
+#include <map>
+#include <string>
+
+#include "mojo/shell/package_manager.h"
+
+class GURL;
+
+namespace mojo {
+namespace shell {
+
+// An implementation of PackageManager used by tests to support content handler
+// registration for MIME types.
+class TestPackageManager : public PackageManager {
+ public:
+  TestPackageManager();
+  virtual ~TestPackageManager();
+
+  void RegisterContentHandler(const std::string& mime_type,
+                              const GURL& content_handler_url);
+
+ private:
+  using MimeTypeToURLMap = std::map<std::string, GURL>;
+
+  // Overridden from PackageManager:
+  void SetApplicationManager(ApplicationManager* manager) override;
+  GURL ResolveURL(const GURL& url) override;
+  void FetchRequest(
+      URLRequestPtr request,
+      const Fetcher::FetchCallback& loader_callback) override;
+  bool HandleWithContentHandler(Fetcher* fetcher,
+                                const GURL& unresolved_url,
+                                base::TaskRunner* task_runner,
+                                URLResponsePtr* new_response,
+                                GURL* content_handler_url,
+                                std::string* qualifier) override;
+
+  MimeTypeToURLMap mime_type_to_url_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestPackageManager);
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // MOJO_SHELL_TEST_PACKAGE_MANAGER_H_