Add mojo package manager skeleton.

mojo/tools/package_manager/package_fetcher.h

Index: mojo/tools/package_manager/package_fetcher.h
diff --git a/mojo/tools/package_manager/package_fetcher.h b/mojo/tools/package_manager/package_fetcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..3cbd7a798e33fe3dd1f2b968ea7009cd4a6aa860
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+++ b/mojo/tools/package_manager/package_fetcher.h
@@ -0,0 +1,63 @@
+// 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.
+
+#ifndef MOJO_TOOLS_PACKAGE_MANAGER_FETCHER_H_
+#define MOJO_TOOLS_PACKAGE_MANAGER_FETCHER_H_
+
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "mojo/common/handle_watcher.h"
+#include "mojo/public/cpp/system/macros.h"
+#include "mojo/services/public/interfaces/network/network_service.mojom.h"
+#include "mojo/services/public/interfaces/network/url_loader.mojom.h"
+#include "url/gurl.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+namespace mojo {
+
+class PackageFetcherDelegate;
+
+class PackageFetcher {
+ public:
+  PackageFetcher(NetworkService* network_service,
+                 PackageFetcherDelegate* delegate,
+                 const GURL& url);
+  virtual ~PackageFetcher();
+
+ private:
+  void OnReceivedResponse(URLResponsePtr response);
+
+  void ReadData(MojoResult);
+  void WaitToReadMore();
+
+  PackageFetcherDelegate* delegate_;
+
+  // URL of the package.
+  GURL url_;
+
+  URLLoaderPtr loader_;
+
+  // Valid once file has started streaming.
+  ScopedDataPipeConsumerHandle body_;
+  common::HandleWatcher handle_watcher_;
+
+  base::FilePath output_file_name_;
+  base::File output_file_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(PackageFetcher);
+};
+
+class PackageFetcherDelegate {
+ public:
+  virtual void FetchSucceeded(const GURL& url, const base::FilePath& name) = 0;
+
+  virtual void FetchFailed(const GURL& url) = 0;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_TOOLS_PACKAGE_MANAGER_FETCHER_H_