Basic HTTP pipelining support

net/http/http_pipelined_host_pool.cc

Index: net/http/http_pipelined_host_pool.cc
diff --git a/net/http/http_pipelined_host_pool.cc b/net/http/http_pipelined_host_pool.cc
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+++ b/net/http/http_pipelined_host_pool.cc
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/http/http_pipelined_host_pool.h"
+
+#include "base/logging.h"
+#include "base/stl_util-inl.h"
+#include "net/http/http_pipelined_host.h"
+#include "net/http/http_stream_factory.h"
+
+namespace net {
+
+HttpPipelinedHostPool::HttpPipelinedHostPool(HttpStreamFactory* factory)
+  : factory_(factory) {
+}
+
+HttpPipelinedHostPool::~HttpPipelinedHostPool() {
+  DCHECK(host_map_.empty());
+}
+
+HttpPipelinedHost* HttpPipelinedHostPool::GetPipelinedHost(
+    const HostPortPair& origin, bool create_if_not_found) {
+  HostMap::iterator it = host_map_.find(origin);
+  if (it != host_map_.end()) {
+    DCHECK(it->second);
+    return it->second;
+  } else if (!create_if_not_found) {
+    return NULL;
+  }
+  HttpPipelinedHost* host = new HttpPipelinedHost(this, origin);
+  host_map_[origin] = host;
+  return host;
+}
+
+void HttpPipelinedHostPool::OnHostIdle(HttpPipelinedHost* host) {
+  const HostPortPair& origin = host->origin();
+  DCHECK(ContainsKey(host_map_, origin));
+  host_map_.erase(origin);
+  delete host;
+}
+
+void HttpPipelinedHostPool::OnHostHasAdditionalCapacity(
+    HttpPipelinedHost* host) {
+  factory_->OnHttpPipelinedHostHasAdditionalCapacity(host);
+}
+
+}  // namespace net