diff --git stream_context.cc stream_context.cc
index e338396..150cde5 100644
--- stream_context.cc
+++ stream_context.cc
@@ -19,6 +19,10 @@ namespace content {
 
 StreamContext::StreamContext() {}
 
+const void* StreamContext::GetUserDataKey() {
+  return kStreamContextKeyName;
+}
+
 StreamContext* StreamContext::GetFor(BrowserContext* context) {
   if (!context->GetUserData(kStreamContextKeyName)) {
     scoped_refptr<StreamContext> stream = new StreamContext();
diff --git stream_context.h stream_context.h
index ad8f65c..60310db 100644
--- stream_context.h
+++ stream_context.h
@@ -28,6 +28,7 @@ class StreamContext
  public:
   StreamContext();
 
+  CONTENT_EXPORT static const void* GetUserDataKey();
   CONTENT_EXPORT static StreamContext* GetFor(BrowserContext* browser_context);
 
   void InitializeOnIOThread();