[reference - do not submit] Always create four pools in TaskSchedulerImpl.

content/child/child_process.h

Index: content/child/child_process.h
diff --git a/content/child/child_process.h b/content/child/child_process.h
index 150fec7b0440d3d5a63e11934f96e008ec422d0f..0e57c116656f23fff571b49fbb6dc26eb03250a4 100644
--- a/content/child/child_process.h
+++ b/content/child/child_process.h
@@ -10,12 +10,15 @@
 
 #include "base/macros.h"
 #include "base/synchronization/waitable_event.h"
-#include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/task_scheduler.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 
+namespace base {
+struct TaskSchedulerInitParams;
+}
+
 namespace content {
 class ChildThreadImpl;
 
@@ -37,17 +40,15 @@ class CONTENT_EXPORT ChildProcess {
  public:
   // Child processes should have an object that derives from this class.
   // Normally you would immediately call set_main_thread after construction.
-  // |io_thread_priority| is the priority of the IO thread. |worker_pool_params|
-  // and |worker_pool_index_for_traits_callback| are used to initialize
-  // TaskScheduler. TaskScheduler is initialized with default values if these
-  // arguments are left empty.
+  // |io_thread_priority| is the priority of the IO thread.
+  // |task_scheduler_name| and |task_scheduler_init_params| are used to
+  // initialize TaskScheduler. Default params are used if
+  // |task_scheduler_init_params| is nullptr.
   ChildProcess(
       base::ThreadPriority io_thread_priority = base::ThreadPriority::NORMAL,
-      const std::vector<base::SchedulerWorkerPoolParams>& worker_pool_params =
-          std::vector<base::SchedulerWorkerPoolParams>(),
-      base::TaskScheduler::WorkerPoolIndexForTraitsCallback
-          worker_pool_index_for_traits_callback =
-              base::TaskScheduler::WorkerPoolIndexForTraitsCallback());
+      const std::string& task_scheduler_name = "ContentChild",
+      std::unique_ptr<base::TaskSchedulerInitParams>
+          task_scheduler_init_params = nullptr);
   virtual ~ChildProcess();
 
   // May be NULL if the main thread hasn't been set explicitly.