SPDY - Added enabling of SPDY/3 to about:flags.

chrome/browser/chrome_browser_main.cc

 // Copyright (c) 2012 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/chrome_browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 807 matching lines @@
   trial->AppendGroup("cwndMin10", kSpdyCwndMin10);
 
   if (parsed_command_line().HasSwitch(switches::kMaxSpdyConcurrentStreams)) {
     int value = 0;
     base::StringToInt(parsed_command_line().GetSwitchValueASCII(
             switches::kMaxSpdyConcurrentStreams),
         &value);
     if (value > 0)
       net::SpdySession::set_max_concurrent_streams(value);
   }
+
+  if (parsed_command_line().HasSwitch(switches::kEnableSpdy3)) {
+    net::HttpStreamFactory::EnableSPDY3();
+  } else if (parsed_command_line().HasSwitch(
+             switches::kEnableSpdyFlowControl)) {
+    net::HttpStreamFactory::EnableFlowControl();
+  } else {
+    const base::FieldTrial::Probability kSpdyDivisor = 100;
+    base::FieldTrial::Probability flow_control_probability = 5;
+    base::FieldTrial::Probability spdy3_probability = 5;
+
+    // After October 30, 2012 builds, it will always be in default group
+    // (disable_spdy_protocol_test).
+    scoped_refptr<base::FieldTrial> trial(
+        new base::FieldTrial(
+            "SpdyProtocolTest", kSpdyDivisor, "disable_spdy_protocol_test",
+            2012, 10, 30));

[Ryan Hamilton, 2012/03/22 16:30:21]

October seems like a long time from now, so this is probably fine.  That being
said, I would have thought we would wait to add this code until we we
comfortable that spdy/3 was working as expected.

[ramant (doing other things), 2012/03/22 16:38:24]

Just to be on safe side, set the probability to 0. In my tests, didn't access
any server which advertised spdy/3. Will change this after getting lot more
testing with Hasan with a spdy/3 server.

Done.

+
+    int spdy3_grp = trial->AppendGroup("spdy3", spdy3_probability);
+    int flow_control_grp = trial->AppendGroup(
+        "flow_control", flow_control_probability);
+
+    int trial_grp = trial->group();
+    if (trial_grp == spdy3_grp) {
+      net::HttpStreamFactory::EnableSPDY3();
+    } else if (trial_grp == flow_control_grp) {
+      net::HttpStreamFactory::EnableFlowControl();
+    }
+  }
 }
 
 // If --socket-reuse-policy is not specified, run an A/B test for choosing the
 // warmest socket.
 void ChromeBrowserMainParts::WarmConnectionFieldTrial() {
   const CommandLine& command_line = parsed_command_line();
   if (command_line.HasSwitch(switches::kSocketReusePolicy)) {
     std::string socket_reuse_policy_str = command_line.GetSwitchValueASCII(
         switches::kSocketReusePolicy);
     int policy = -1;
@@ skipping 1105 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }