Initialize TaskScheduler in remoting processes.

remoting/host/remoting_me2me_host.cc

Index: remoting/host/remoting_me2me_host.cc
diff --git a/remoting/host/remoting_me2me_host.cc b/remoting/host/remoting_me2me_host.cc
index aaae9dbd264bb4e4615281c94a4e4f159cfb090d..a34ffa152c55a8a330bbf60669cfbee6dee2e0b5 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -26,6 +26,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringize_macros.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/task_scheduler/task_scheduler.h"
 #include "build/build_config.h"
 #include "components/policy/policy_constants.h"
 #include "ipc/ipc_channel.h"
@@ -1641,6 +1642,9 @@ int HostProcessMain() {
   base::GetLinuxDistro();
 #endif
 
+  const int kMaxBackgroundThreads = 5;
+  base::TaskScheduler::CreateAndSetSimpleTaskScheduler(kMaxBackgroundThreads);
+
   // Create the main message loop and start helper threads.
   base::MessageLoopForUI message_loop;
   std::unique_ptr<ChromotingHostContext> context =