Enable spdy to 95%, npn only to 5%.

chrome/browser/browser_main.cc

 // Copyright (c) 2010 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 "chrome/browser/browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 326 matching lines @@
 void BrowserMainParts::SpdyFieldTrial() {
   bool is_spdy_trial = false;
   if (parsed_command_line().HasSwitch(switches::kUseSpdy)) {
     std::string spdy_mode =
         parsed_command_line().GetSwitchValueASCII(switches::kUseSpdy);
     net::HttpNetworkLayer::EnableSpdy(spdy_mode);
   } else {
     const FieldTrial::Probability kSpdyDivisor = 1000;
     // To enable 100% npn_with_spdy, set npnhttp_probability = 0 and set
     // npnspdy_probability = FieldTrial::kAllRemainingProbability.
-    // To collect stats, make sure that FieldTrial are distributed among
-    // all the three groups:
-    // npn_with_spdy : 50%, npn_with_http : 25%, default (no npn, no spdy): 25%.
-    // a. npn_with_spdy and default: these are used to collect stats for
-    //    alternate protocol with spdy vs. no alternate protocol case.
-    // b. npn_with_spdy and npn_with_http: these are used to collect stats for
-    //    https vs. https over spdy case.
-    FieldTrial::Probability npnhttp_probability = 250;
-    FieldTrial::Probability npnspdy_probability = 500;
+    FieldTrial::Probability npnhttp_probability = 50;
+    FieldTrial::Probability npnspdy_probability = 950;
     scoped_refptr<FieldTrial> trial =
         new FieldTrial("SpdyImpact", kSpdyDivisor);
     // npn with only http support, no spdy.
     int npn_http_grp =
         trial->AppendGroup("npn_with_http", npnhttp_probability);
     // npn with spdy support.
     int npn_spdy_grp =
         trial->AppendGroup("npn_with_spdy", npnspdy_probability);
     int trial_grp = trial->group();
     if (trial_grp == npn_http_grp) {
@@ skipping 1088 matching lines @@
   metrics->Stop();
 
   // browser_shutdown takes care of deleting browser_process, so we need to
   // release it.
   ignore_result(browser_process.release());
   browser_shutdown::Shutdown();
 
   TRACE_EVENT_END("BrowserMain", 0, 0);
   return result_code;
 }