Background tracing: Enable field-trial control on Android

chrome/browser/prefs/browser_prefs.cc

 // Copyright 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/prefs/browser_prefs.h"
 
 #include <string>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 280 matching lines @@
 }  // namespace
 
 namespace chrome {
 
 void RegisterLocalState(PrefRegistrySimple* registry) {
   // Please keep this list alphabetized.
   AppListService::RegisterPrefs(registry);
   browser_shutdown::RegisterPrefs(registry);
   BrowserProcessImpl::RegisterPrefs(registry);
   ChromeMetricsServiceClient::RegisterPrefs(registry);
+  ChromeTracingDelegate::RegisterPrefs(registry);
   chrome_prefs::RegisterPrefs(registry);
   variations::VariationsService::RegisterPrefs(registry);
   component_updater::RegisterPrefsForRecoveryComponent(registry);
   component_updater::SupervisedUserWhitelistInstaller::RegisterPrefs(registry);
   ExternalProtocolHandler::RegisterPrefs(registry);
   flags_ui::PrefServiceFlagsStorage::RegisterPrefs(registry);
   geolocation::RegisterPrefs(registry);
   GLStringManager::RegisterPrefs(registry);
   GpuModeManager::RegisterPrefs(registry);
   IntranetRedirectDetector::RegisterPrefs(registry);
@@ skipping 27 matching lines @@
 
 #if defined(ENABLE_TASK_MANAGER)
   task_management::TaskManagerInterface::RegisterPrefs(registry);
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 #if BUILDFLAG(ENABLE_BACKGROUND)
   BackgroundModeManager::RegisterPrefs(registry);
 #endif
 
 #if !defined(OS_ANDROID)
-  ChromeTracingDelegate::RegisterPrefs(registry);
   RegisterBrowserPrefs(registry);
   StartupBrowserCreator::RegisterLocalStatePrefs(registry);
   // The native GCM is used on Android instead.
   gcm::GCMChannelStatusSyncer::RegisterPrefs(registry);
   UpgradeDetector::RegisterPrefs(registry);
 #if !defined(OS_CHROMEOS)
   RegisterDefaultBrowserPromptPrefs(registry);
 #endif  // !defined(OS_CHROMEOS)
 #endif  // !defined(OS_ANDROID)
 
@@ skipping 334 matching lines @@
     profile_prefs->SetInt64(prefs::kDefaultBrowserLastDeclined,
                             install_time.ToInternalValue());
   }
   profile_prefs->ClearPref(kCheckDefaultBrowser);
 
   // Added 5/2016.
   profile_prefs->ClearPref(kDesktopSearchRedirectionInfobarShownPref);
 }
 
 }  // namespace chrome