Initialize TaskScheduler in renderers.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index f2a854f75735738adacdcd120b69eb2fdcf1291c..0ea5c1b243c4cf7342e5cccf76b061380d2c6bcb 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -12,7 +12,7 @@
 #include <string>
 #include <vector>
 
-#include "base/bind.h"
+#include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
@@ -28,7 +28,9 @@ class SkBitmap;
 
 namespace base {
 class FilePath;
+class SchedulerWorkerPoolParams;
 class SingleThreadTaskRunner;
+class TaskTraits;
 }
 
 namespace blink {
@@ -136,6 +138,18 @@ class CONTENT_EXPORT ContentRendererClient {
   virtual bool ShouldSuppressErrorPage(RenderFrame* render_frame,
                                        const GURL& url);
 
+  // Provides TaskScheduler initialization arguments.
+  // |worker_pool_params_vector| describes the worker pools to create.
+  // |worker_pool_index_for_traits_callback| returns the index in
+  // |worker_pool_params_vector| of the worker pool in which a task with given
+  // traits should run. |redirect_sequenced_worker_pool| indicates whether tasks
+  // posted to a SequencedWorkerPool should be redirected to TaskScheduler.
+  virtual void GetTaskSchedulerInitializationArguments(
+      std::vector<base::SchedulerWorkerPoolParams>* worker_pool_params_vector,
+      base::Callback<size_t(const base::TaskTraits& traits)>*
+          worker_pool_index_for_traits_callback,
+      bool* redirect_sequenced_worker_pool);
+
   // Returns the information to display when a navigation error occurs.
   // If |error_html| is not null then it may be set to a HTML page containing
   // the details of the error and maybe links to more info.