Make URLRequestContextBuilder use base/task_scheduler/

net/url_request/url_request_context_builder.h

Index: net/url_request/url_request_context_builder.h
diff --git a/net/url_request/url_request_context_builder.h b/net/url_request/url_request_context_builder.h
index 2a520017cae85457ef517e3a0daf942eba8e52dc..e4c77c66aa896fd69d75db0705cf7ac559ca2d81 100644
--- a/net/url_request/url_request_context_builder.h
+++ b/net/url_request/url_request_context_builder.h
@@ -26,6 +26,7 @@
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/task_scheduler/task_traits.h"
 #include "build/build_config.h"
 #include "net/base/net_export.h"
 #include "net/base/network_delegate.h"
@@ -42,6 +43,8 @@
 
 namespace base {
 class SingleThreadTaskRunner;
+class SequencedTaskRunner;
+class TaskRunner;
 }
 
 namespace net {
@@ -325,8 +328,8 @@ class NET_EXPORT URLRequestContextBuilder {
       std::unique_ptr<CookieStore> cookie_store,
       std::unique_ptr<ChannelIDService> channel_id_service);
 
-  // Sets the task runner used to perform file operations. If not set, one will
-  // be created.
+  // Sets the task runner used to perform file operations. If not set,
+  // TaskSchedulers will be used instead.
   void SetFileTaskRunner(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
@@ -358,6 +361,16 @@ class NET_EXPORT URLRequestContextBuilder {
       NetworkDelegate* network_delegate,
       NetLog* net_log);
 
+  // Returns a TaskRunner with the specified traits. If |file_task_runner_| is
+  // non-NULL, uses that. Otherwise, uses base/task_scheduler/ and the specified
+  // traits.
+  scoped_refptr<base::TaskRunner> GetFileTaskRunner(
+      const base::TaskTraits& traits);
+  scoped_refptr<base::SequencedTaskRunner> GetFileSequencedTaskRunner(
+      const base::TaskTraits& traits);
+  scoped_refptr<base::SingleThreadTaskRunner> GetFileSingleThreadTaskRunner(
+      const base::TaskTraits& traits);
+
  private:
   const char* name_;
   bool enable_brotli_;