Basic HTTP pipelining support

net/http/http_stream_factory.h

Index: net/http/http_stream_factory.h
diff --git a/net/http/http_stream_factory.h b/net/http/http_stream_factory.h
index 097915e32c28ad569aaab2d25ccb531223646a46..c00a29ef0570b0804f87f9b05e58f3ab87f1174c 100644
--- a/net/http/http_stream_factory.h
+++ b/net/http/http_stream_factory.h
@@ -24,6 +24,7 @@ class HostPortPair;
 class HttpAlternateProtocols;
 class HttpAuthController;
 class HttpNetworkSession;
+class HttpPipelinedHost;
 class HttpResponseInfo;
 class HttpStream;
 class ProxyInfo;
@@ -172,6 +173,11 @@ class NET_EXPORT HttpStreamFactory {
   virtual void AddTLSIntolerantServer(const HostPortPair& server) = 0;
   virtual bool IsTLSIntolerantServer(const HostPortPair& server) const = 0;
 
+  // Called when a HttpPipelinedHost has new capacity. Attempts to allocate any
+  // pending pipeline-capable requests to the host.
+  virtual void OnHttpPipelinedHostHasAdditionalCapacity(
+      HttpPipelinedHost* host) = 0;
+
   // Static settings
   static GURL ApplyHostMappingRules(const GURL& url, HostPortPair* endpoint);
 
@@ -226,6 +232,11 @@ class NET_EXPORT HttpStreamFactory {
 
   static void SetHostMappingRules(const std::string& rules);
 
+  static void set_http_pipelining_enabled(bool value) {
+    http_pipelining_enabled_ = value;
+  }
+  static bool http_pipelining_enabled() { return http_pipelining_enabled_; }
+
  protected:
   HttpStreamFactory();
 
@@ -240,6 +251,7 @@ class NET_EXPORT HttpStreamFactory {
   static bool force_spdy_always_;
   static std::list<HostPortPair>* forced_spdy_exclusions_;
   static bool ignore_certificate_errors_;
+  static bool http_pipelining_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamFactory);
 };