Implement the Stream registry in content

content/browser/streams/stream_registry.h

Index: content/browser/streams/stream_registry.h
diff --git a/content/browser/streams/stream_registry.h b/content/browser/streams/stream_registry.h
new file mode 100644
index 0000000000000000000000000000000000000000..eaab7ef0b258a4a5b79aa4e5039a439c5f8de213
--- /dev/null
+++ b/content/browser/streams/stream_registry.h
@@ -0,0 +1,51 @@
+// Copyright (c) 2013 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 CONTENT_BROWSER_STREAMS_STREAM_REGISTRY_H_
+#define CONTENT_BROWSER_STREAMS_STREAM_REGISTRY_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/non_thread_safe.h"
+#include "content/common/content_export.h"
+#include "googleurl/src/gurl.h"
+
+namespace content {
+
+class Stream;
+
+// Maintains a mapping of blob: URLs to active streams.
+class CONTENT_EXPORT StreamRegistry : public base::NonThreadSafe {
+ public:
+  StreamRegistry();
+  virtual ~StreamRegistry();
+
+  // Registers a stream, and sets its URL.
+  void RegisterStream(scoped_refptr<Stream> stream);
+
+  // Clones a stream.  Returns true on success, or false if |src_url| doesn't
+  // exist.
+  bool CloneStream(const GURL& url, const GURL& src_url);
+
+  void UnregisterStream(const GURL& url);
+
+  // Gets the stream associated with |url|.  Returns NULL if there is no such
+  // stream.
+  scoped_refptr<Stream> GetStream(const GURL& url);
+
+ private:
+  typedef std::map<GURL, scoped_refptr<Stream> > StreamMap;
+
+  StreamMap streams_;
+
+  DISALLOW_COPY_AND_ASSIGN(StreamRegistry);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_STREAMS_STREAM_REGISTRY_H_
+
+