Perform ClientHello padding if the field trial is enabled

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 1f969ec4a63fce5acf8c46d0cb821f4e939e9454..f197841cd62b42a274f3eb1418b899d53f61096b 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -59,6 +59,7 @@ class NetworkDelegate;
 class ProxyConfigService;
 class ProxyService;
 class SSLConfigService;
+class SSLSocketConfigService;
 class TransportSecurityState;
 class URLRequestContext;
 class URLRequestContextGetter;
@@ -198,6 +199,7 @@ class IOThread : public content::BrowserThreadDelegate {
     // main frame load fails with a DNS error in order to provide more useful
     // information to the renderer so it can show a more specific error page.
     scoped_ptr<chrome_browser_net::DnsProbeService> dns_probe_service;
+    scoped_ptr<net::SSLSocketConfigService> ssl_socket_config_service;
   };
 
   // |net_log| must either outlive the IOThread or be NULL.
@@ -308,6 +310,10 @@ class IOThread : public content::BrowserThreadDelegate {
   // well as the QUIC field trial group.
   void ConfigureQuic(const base::CommandLine& command_line);
 
+  // Configures SSLSocketConfigService based on the flags in |command_line| as
+  // well as the ClientHello field trial group.
+  void ConfigureSSLSocketConfigService(const base::CommandLine& command_line);
+
   extensions::EventRouterForwarder* extension_event_router_forwarder() {
 #if defined(ENABLE_EXTENSIONS)
     return extension_event_router_forwarder_;
@@ -396,6 +402,13 @@ class IOThread : public content::BrowserThreadDelegate {
       const base::CommandLine& command_line,
       const VariationParameters& quic_trial_params);
 
+  // Configures the SSLSocketConfigService in |globals| based on the flags in
+  // |command_line| as well as the ClientHello field trial group.
+  static void ConfigureSSLSocketConfigServiceGlobals(
+      const base::CommandLine& command_line,
+      base::StringPiece client_hello_trial_group,
+      Globals* globals);
+
   // The NetLog is owned by the browser process, to allow logging from other
   // threads during shutdown, but is used most frequently on the IOThread.
   ChromeNetLog* net_log_;