Warmth of a connection (cwnd) is estimated by the amount of data written to the socket.

Choosing the warmest connection would mean faster resource load times. 

idle time is the time a socket has remained idle (no http requests being served on it). 
Probability of server resetting a connection increases with idle time duration. 

Using a cost function that takes into account bytes transferred and idle time to pick best connection to schedule http requests on.

CODEREVIEW done in http://codereview.chromium.org/6990036/

Contributed by gagansingh@google.com

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=90373

Reverted: http://codereview.chromium.org/7255002 :(

Have fixed 2 things since:
1. Removed LOG(ERROR) from http_basic_stream.cc that was causing layout tests to fail.
2. Initialized class variables in http_basic_stream.cc that was causing uninitialized memory bugs in valgrind: http://code.google.com/p/chromium/issues/detail?id=87423

Review URL: http://codereview.chromium.org/7251004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90601 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 11 insertions, 0 deletions

diff --git a/net/spdy/spdy_http_stream.h b/net/spdy/spdy_http_stream.h
index 88c627d..b6727e5 100644
--- a/net/spdy/spdy_http_stream.h
+++ b/net/spdy/spdy_http_stream.h
@@ -68,6 +68,7 @@ class NET_TEST SpdyHttpStream : public SpdyStream::Delegate, public HttpStream {
   virtual void GetSSLCertRequestInfo(
       SSLCertRequestInfo* cert_request_info) OVERRIDE;
   virtual bool IsSpdyHttpStream() const OVERRIDE;
+  virtual void LogNumRttVsBytesMetrics() const OVERRIDE {}
 
   // SpdyStream::Delegate methods:
   virtual bool OnSendHeadersComplete(int status) OVERRIDE;
diff --git a/net/spdy/spdy_proxy_client_socket.cc b/net/spdy/spdy_proxy_client_socket.cc
index 1e6e23a..c5733cf 100644
--- a/net/spdy/spdy_proxy_client_socket.cc
+++ b/net/spdy/spdy_proxy_client_socket.cc
@@ -138,6 +138,14 @@ bool SpdyProxyClientSocket::UsingTCPFastOpen() const {
   return false;
 }
 
+int64 SpdyProxyClientSocket::NumBytesRead() const {
+  return -1;
+}
+
+base::TimeDelta SpdyProxyClientSocket::GetConnectTimeMicros() const {
+  return base::TimeDelta::FromMicroseconds(-1);
+}
+
 int SpdyProxyClientSocket::Read(IOBuffer* buf, int buf_len,
                                 CompletionCallback* callback) {
   DCHECK(!read_callback_);
diff --git a/net/spdy/spdy_proxy_client_socket.h b/net/spdy/spdy_proxy_client_socket.h
index d7510d1..e6598ea 100644
--- a/net/spdy/spdy_proxy_client_socket.h
+++ b/net/spdy/spdy_proxy_client_socket.h
@@ -77,6 +77,8 @@ class NET_TEST SpdyProxyClientSocket : public ProxyClientSocket,
   virtual void SetOmniboxSpeculation();
   virtual bool WasEverUsed() const;
   virtual bool UsingTCPFastOpen() const;
+  virtual int64 NumBytesRead() const;
+  virtual base::TimeDelta GetConnectTimeMicros() const;
 
   // Socket methods:
   virtual int Read(IOBuffer* buf, int buf_len, CompletionCallback* callback);