Allow for pausing background tabs on desktop via about:flags.

chrome/renderer/chrome_content_renderer_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/renderer/chrome_content_renderer_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 10 matching lines @@
 #include "base/time/time.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_isolated_world_ids.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/crash_keys.h"
 #include "chrome/common/features.h"
+#include "chrome/common/pause_tabs_field_trial.h"
 #include "chrome/common/pepper_permission_util.h"
 #include "chrome/common/prerender_types.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/secure_origin_whitelist.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "chrome/grit/locale_settings.h"
 #include "chrome/grit/renderer_resources.h"
 #include "chrome/renderer/app_categorizer.h"
@@ skipping 1028 matching lines @@
 #else
   return true;
 #endif
 }
 
 bool ChromeContentRendererClient::
     AllowTimerSuspensionWhenProcessBackgrounded() {
 #if defined(OS_ANDROID)
   return true;
 #else
-  return false;
+  // TODO(ojan): Plumb the engagement values for this feature to WebViewImpl.
+  return base::FeatureList::IsEnabled(pausetabs::kPauseBackgroundTabsFeature);
 #endif
 }
 
 bool ChromeContentRendererClient::AllowPopup() {
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   return ChromeExtensionsRendererClient::GetInstance()->AllowPopup();
 #else
   return false;
 #endif
 }
@@ skipping 427 matching lines @@
 
   RecordYouTubeRewriteUMA(result);
   return corrected_url.ReplaceComponents(r);
 }
 
 std::unique_ptr<base::TaskScheduler::InitParams>
 ChromeContentRendererClient::GetTaskSchedulerInitParams() {
   return task_scheduler_util::
       GetRendererTaskSchedulerInitParamsFromCommandLine();
 }