Experiment with redirecting all BrowserThreads (but UI/IO) to TaskScheduler

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 66f12903b04a0ca3999d135d919853b2882f03a1..fd6fbd30f692962770e379e15216e4a503f5033e 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -3372,7 +3372,13 @@ void ChromeContentBrowserClient::
       MaybePerformBrowserTaskSchedulerRedirection();
 }
 
-//static
+bool ChromeContentBrowserClient::
+    RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
+  return variations::GetVariationParamValue(
+             "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
+}
+
+// static
 void ChromeContentBrowserClient::SetDefaultQuotaSettingsForTesting(
     const storage::QuotaSettings* settings) {
   g_default_quota_settings = settings;