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

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 1888 matching lines @@
       switches::kEnableNaClNonSfiMode,
 #endif
       switches::kEnableNetBenchmarking,
 #if !defined(DISABLE_NACL)
       switches::kForcePNaClSubzero,
 #endif
       switches::kJavaScriptHarmony,
       switches::kOriginTrialDisabledFeatures,
       switches::kOriginTrialDisabledTokens,
       switches::kOriginTrialPublicKey,
+#if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_MACOSX) || \
+    defined(OS_WIN)
+      switches::kPauseBackgroundTabs,
+#endif
       switches::kPpapiFlashArgs,
       switches::kPpapiFlashPath,
       switches::kPpapiFlashVersion,
       switches::kProfilingAtStart,
       switches::kProfilingFile,
       switches::kProfilingFlush,
       switches::kReaderModeHeuristics,
       switches::kUnsafelyTreatInsecureOriginAsSecure,
       translate::switches::kTranslateSecurityOrigin,
     };
@@ skipping 1691 matching lines @@
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }
 
 // static
 void ChromeContentBrowserClient::SetDefaultQuotaSettingsForTesting(
     const storage::QuotaSettings* settings) {
   g_default_quota_settings = settings;
 }