Basic HTTP pipelining support

net/http/http_stream_factory_impl_job.h

Index: net/http/http_stream_factory_impl_job.h
diff --git a/net/http/http_stream_factory_impl_job.h b/net/http/http_stream_factory_impl_job.h
index 48ef2a26489c40c6b3d2ba3b524fa19ef1d11966..71fc1620dce38dcc199ad5c078ab704cf0f9ee79 100644
--- a/net/http/http_stream_factory_impl_job.h
+++ b/net/http/http_stream_factory_impl_job.h
@@ -24,6 +24,7 @@ namespace net {
 class ClientSocketHandle;
 class HttpAuthController;
 class HttpNetworkSession;
+class HttpPipelinedConnection;
 class HttpProxySocketParams;
 class HttpStream;
 class SOCKSSocketParams;
@@ -198,6 +199,8 @@ class HttpStreamFactoryImpl::Job {
   // Should we force SPDY to run without SSL for this stream request.
   bool ShouldForceSpdyWithoutSSL() const;
 
+  bool IsRequestEligibleForPipelining() const;
+
   // Record histograms of latency until Connect() completes.
   static void LogHttpConnectedMetrics(const ClientSocketHandle& handle);
 
@@ -277,6 +280,9 @@ class HttpStreamFactoryImpl::Job {
   // Only used if |new_spdy_session_| is non-NULL.
   bool spdy_session_direct_;
 
+  // Initialized when an existing pipeline can handle this job's request.
+  HttpPipelinedConnection* existing_available_pipeline_;
+
   ScopedRunnableMethodFactory<Job> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Job);