Control TaskScheduler initialization params in renderers via field trial.

chrome/browser/chrome_content_browser_client.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_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 132 matching lines @@
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/rappor/public/rappor_utils.h"
 #include "components/rappor/rappor_recorder_impl.h"
 #include "components/rappor/rappor_service_impl.h"
 #include "components/safe_browsing_db/safe_browsing_prefs.h"
 #include "components/security_interstitials/core/ssl_error_ui.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "components/spellcheck/spellcheck_build_features.h"
 #include "components/startup_metric_utils/browser/startup_metric_host_impl.h"
+#include "components/task_scheduler_util/common/variations_util.h"
 #include "components/task_scheduler_util/initialization/browser_util.h"
 #include "components/task_scheduler_util/variations/browser_variations_util.h"
 #include "components/translate/core/common/translate_switches.h"
 #include "components/url_formatter/url_fixer.h"
 #include "components/variations/variations_associated_data.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_child_process_host.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 1648 matching lines @@
 
   // The command line switch kEnableBenchmarking needs to be specified along
   // with the kEnableStatsTable switch to ensure that the stats table global
   // is initialized correctly.
   if (command_line->HasSwitch(switches::kEnableBenchmarking))
     DCHECK(command_line->HasSwitch(switches::kEnableStatsTable));
 
   StackSamplingConfiguration::Get()->AppendCommandLineSwitchForChildProcess(
       process_type,
       command_line);
+
+  if (process_type == switches::kRendererProcess) {
+    task_scheduler_util::AddVariationParamsToCommandLine("Renderer",
+                                                         command_line);
+  }
 }
 
 std::string ChromeContentBrowserClient::GetApplicationLocale() {
   if (BrowserThread::CurrentlyOn(BrowserThread::IO))
     return g_io_thread_application_locale.Get();
   return g_browser_process->GetApplicationLocale();
 }
 
 std::string ChromeContentBrowserClient::GetAcceptLangs(
     content::BrowserContext* context) {
@@ skipping 1531 matching lines @@
 bool ChromeContentBrowserClient::ShouldRedirectDOMStorageTaskRunner() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectDOMStorageTaskRunner") == "true";
 }
 
 bool ChromeContentBrowserClient::
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }