Add a force pipelining option to load flags.

net/http/http_pipelined_host_impl.h

Index: net/http/http_pipelined_host_impl.h
diff --git a/net/http/http_pipelined_host_impl.h b/net/http/http_pipelined_host_impl.h
index 48c282b9a0b74fba00fe2337804f1097b7ff51eb..55e929ea10e0397026fd0620e9a7c9e7bbba4e95 100644
--- a/net/http/http_pipelined_host_impl.h
+++ b/net/http/http_pipelined_host_impl.h
@@ -37,7 +37,7 @@ class NET_EXPORT_PRIVATE HttpPipelinedHostImpl
       public HttpPipelinedConnection::Delegate {
  public:
   HttpPipelinedHostImpl(HttpPipelinedHost::Delegate* delegate,
-                        const HostPortPair& origin,
+                        const HttpPipelinedHost::Key& key,
                         HttpPipelinedConnection::Factory* factory,
                         HttpPipelinedHostCapability capability);
   virtual ~HttpPipelinedHostImpl();
@@ -66,7 +66,7 @@ class NET_EXPORT_PRIVATE HttpPipelinedHostImpl
       HttpPipelinedConnection* pipeline,
       HttpPipelinedConnection::Feedback feedback) OVERRIDE;
 
-  virtual const HostPortPair& origin() const OVERRIDE;
+  virtual const Key& GetKey() const OVERRIDE;
 
   // Creates a Value summary of this host's |pipelines_|. Caller assumes
   // ownership of the returned Value.
@@ -105,7 +105,7 @@ class NET_EXPORT_PRIVATE HttpPipelinedHostImpl
   void NotifyAllPipelinesHaveCapacity();
 
   HttpPipelinedHost::Delegate* delegate_;
-  const HostPortPair origin_;
+  const Key key_;
   PipelineInfoMap pipelines_;
   scoped_ptr<HttpPipelinedConnection::Factory> factory_;
   HttpPipelinedHostCapability capability_;