Initial implementation of FeatureList in base/.

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>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/debug/debugger.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/metrics/feature_list.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/path_service.h"
 #include "base/prefs/json_pref_store.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/pref_value_store.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/profiler/scoped_profile.h"
 #include "base/profiler/scoped_tracker.h"
@@ skipping 642 matching lines @@
     // 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);
   }
+
+  scoped_ptr<base::FeatureList> feature_list(new base::FeatureList);
+  feature_list->InitializeFromCommandLine(
+      command_line->GetSwitchValueASCII(switches::kEnableFeatures),
+      command_line->GetSwitchValueASCII(switches::kDisableFeatures));
+
   chrome_variations::VariationsService* variations_service =
       browser_process_->variations_service();
   if (variations_service)
     variations_service->CreateTrialsFromSeed();
 
+  // TODO(asvitkine): Pass |feature_list| to CreateTrialsFromSeed() above.
+  base::FeatureList::SetInstance(feature_list.Pass());
+
   // This must be called after |local_state_| is initialized.
   browser_field_trials_.SetupFieldTrials();
 
   // Enable Navigation Tracing only if a trace upload url is specified.
   if (command_line->HasSwitch(switches::kEnableNavigationTracing) &&
       command_line->HasSwitch(switches::kTraceUploadURL)) {
     tracing::SetupNavigationTracing();
   }
 
   // Initialize FieldTrialSynchronizer system. This is a singleton and is used
@@ skipping 1116 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }