Split browser-specific and generic code in components/task_scheduler_util/.

components/task_scheduler_util/browser/initialization.h

+// Copyright 2016 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.
+
+#ifndef COMPONENTS_TASK_SCHEDULER_UTIL_BROWSER_INITIALIZATION_H_
+#define COMPONENTS_TASK_SCHEDULER_UTIL_BROWSER_INITIALIZATION_H_
+
+#include <stddef.h>
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/task_scheduler/scheduler_worker_pool_params.h"
+#include "build/build_config.h"
+
+namespace base {
+class TaskTraits;
+}
+
+namespace task_scheduler_util {
+
+// Gets a vector of SchedulerWorkerPoolParams to initialize TaskScheduler in the
+// browser based off variations. Returns an empty vector on failure.
+std::vector<base::SchedulerWorkerPoolParams>
+GetBrowserWorkerPoolParamsFromVariations();
+
+#if defined(OS_IOS)
+// Returns a default vector of SchedulerWorkerPoolParams to initialize
+// TaskScheduler in the browser.
+std::vector<base::SchedulerWorkerPoolParams>
+GetDefaultBrowserWorkerPoolParams();
+#endif
+
+// Maps |traits| to the index of a browser worker pool vector provided by
+// GetBrowserWorkerPoolParamsFromVariations() or
+// GetDefaultBrowserWorkerPoolParams().
+size_t BrowserWorkerPoolIndexForTraits(const base::TaskTraits& traits);
+
+// Redirects zero-to-many PostTask APIs to the browser task scheduler based off
+// variations.
+void MaybePerformBrowserTaskSchedulerRedirection();
+
+}  // namespace task_scheduler_util
+
+#endif  // COMPONENTS_TASK_SCHEDULER_UTIL_BROWSER_INITIALIZATION_H_