TaskScheduler: Make the worker pools of TaskSchedulerImpl configurable

base/task_scheduler/task_scheduler_impl_unittest.cc

Index: base/task_scheduler/task_scheduler_impl_unittest.cc
diff --git a/base/task_scheduler/task_scheduler_impl_unittest.cc b/base/task_scheduler/task_scheduler_impl_unittest.cc
index 50e0caeb1c7059f467376c2ac7311a3eb01e841f..47fbf7b16c54470d4d2a1e30e0182a8fcb61d0f8 100644
--- a/base/task_scheduler/task_scheduler_impl_unittest.cc
+++ b/base/task_scheduler/task_scheduler_impl_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <stddef.h>
 
+#include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ -44,7 +45,8 @@ class TaskSchedulerImplTest
   TaskSchedulerImplTest() = default;
 
   void SetUp() override {
-    scheduler_ = TaskSchedulerImpl::Create();
+    scheduler_ =
+        TaskSchedulerImpl::Create(std::map<std::string, std::string>());
     EXPECT_TRUE(scheduler_);
   }
   void TearDown() override { scheduler_->JoinForTesting(); }
@@ -195,7 +197,8 @@ INSTANTIATE_TEST_CASE_P(OneTraitsExecutionModePair,
 // the expected priority and I/O restrictions and respects the characteristics
 // of its ExecutionMode.
 TEST(TaskSchedulerImplTest, MultipleTraitsExecutionModePairs) {
-  std::unique_ptr<TaskSchedulerImpl> scheduler = TaskSchedulerImpl::Create();
+  std::unique_ptr<TaskSchedulerImpl> scheduler =
+      TaskSchedulerImpl::Create(std::map<std::string, std::string>());
 
   std::vector<std::unique_ptr<ThreadPostingTasks>> threads_posting_tasks;
   for (const auto& traits_execution_mode_pair : GetTraitsExecutionModePairs()) {