Plumbing for variations headers from synthetic field trials.

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 <set>
 #include <string>
 #include <vector>
 
@@ skipping 603 matching lines @@
   }
   if (command_line->HasSwitch(switches::kForceVariationIds)) {
     // Create default variation ids which will always be included in the
     // X-Client-Data request header.
     variations::VariationsHttpHeaderProvider* provider =
         variations::VariationsHttpHeaderProvider::GetInstance();
     bool result = provider->SetDefaultVariationIds(
         command_line->GetSwitchValueASCII(switches::kForceVariationIds));
     CHECK(result) << "Invalid --" << switches::kForceVariationIds
                   << " list specified.";
+    metrics->AddSyntheticTrialObserver(provider);
   }
   chrome_variations::VariationsService* variations_service =
       browser_process_->variations_service();
   if (variations_service)
     variations_service->CreateTrialsFromSeed();
 
   // This must be called after |local_state_| is initialized.
   browser_field_trials_.SetupFieldTrials(
       base::Time::FromTimeT(metrics->GetInstallDate()), local_state_);
 
@@ skipping 1049 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif
 #endif
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }