Record network latency stats for Win HTTP in a histogram

r=wtc
Review URL: http://codereview.chromium.org/12972

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6414 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 12 insertions, 1 deletions

diff --git a/net/http/http_transaction_winhttp.cc b/net/http/http_transaction_winhttp.cc
index aa52faf..20019ef 100644
--- a/net/http/http_transaction_winhttp.cc
+++ b/net/http/http_transaction_winhttp.cc
@@ -977,8 +977,10 @@ int HttpTransactionWinHttp::Read(char* buf, int buf_len,
   DCHECK(request_handle_);
 
   // If we have already received the full response, then we know we are done.
-  if (content_length_remaining_ == 0)
+  if (content_length_remaining_ == 0) {
+    LogTransactionMetrics();
     return 0;
+  }
 
   session_callback_->set_read_buf(buf);
   session_callback_->set_read_buf_len(buf_len);
@@ -1439,6 +1441,7 @@ int HttpTransactionWinHttp::DidReadData(DWORD num_bytes) {
   // We have read the entire response.  Mark the request done to unblock a
   // queued request.
   if (rv == 0) {
+    LogTransactionMetrics();
     DCHECK(request_submitted_);
     request_submitted_ = false;
     session_->request_throttle()->NotifyRequestDone(connect_peer_);
@@ -1447,6 +1450,13 @@ int HttpTransactionWinHttp::DidReadData(DWORD num_bytes) {
   return rv;
 }
 
+void HttpTransactionWinHttp::LogTransactionMetrics() const {
+  base::TimeDelta duration = base::Time::Now() - response_.request_time;
+  if (60 < duration.InMinutes())
+    return;
+  UMA_HISTOGRAM_LONG_TIMES(L"Net.Transaction_Latency_WinHTTP", duration);
+}
+
 int HttpTransactionWinHttp::DidReceiveHeaders() {
   session_callback_->set_load_state(LOAD_STATE_IDLE);
 
diff --git a/net/http/http_transaction_winhttp.h b/net/http/http_transaction_winhttp.h
index 46b69d8..3d46306 100644
--- a/net/http/http_transaction_winhttp.h
+++ b/net/http/http_transaction_winhttp.h
@@ -93,6 +93,7 @@ class HttpTransactionWinHttp : public HttpTransaction {
   int DidSendRequest();
   int DidWriteData(DWORD num_bytes);
   int DidReadData(DWORD num_bytes);
+  void LogTransactionMetrics() const;
   int DidReceiveHeaders();
 
   int PopulateAuthChallenge();