Introduce StreamRegistry::NotifyReaderAbortedBeforeRegistration()

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
index ce7f6b15bcb7b957a2105101282863408b3a1b22..eac067181245cd1b303465e1d869bdb79265dae2 100644
--- a/content/browser/streams/stream_registry.h
+++ b/content/browser/streams/stream_registry.h
@@ -25,7 +25,7 @@ class CONTENT_EXPORT StreamRegistry : public base::NonThreadSafe {
   virtual ~StreamRegistry();
 
   // Registers a stream, and sets its URL.
-  void RegisterStream(scoped_refptr<Stream> stream);
+  void RegisterStream(Stream* stream);
 
   // Clones a stream.  Returns true on success, or false if |src_url| doesn't
   // exist.
@@ -53,11 +53,17 @@ class CONTENT_EXPORT StreamRegistry : public base::NonThreadSafe {
   void SetRegisterObserver(const GURL& url, StreamRegisterObserver* observer);
   void RemoveRegisterObserver(const GURL& url);
 
+  // If the reader is aborted before the stream is registered, call this method
+  // to reduce the memory consumption. After this method is called,
+  // RegisterStream doesn't register the stream of the URL.
+  void NotifyReaderAbortedBeforeRegistration(const GURL& url);
+
  private:
   typedef std::map<GURL, scoped_refptr<Stream> > StreamMap;
 
   StreamMap streams_;
   std::map<GURL, StreamRegisterObserver*> register_observers_;
+  std::set<GURL> reader_aborted_urls_;
 
   size_t total_memory_usage_;