base: Move renderer threads to the appropriate cpuset.

content/child/child_process.cc

Index: content/child/child_process.cc
diff --git a/content/child/child_process.cc b/content/child/child_process.cc
index 9805c062f55c1872eb540abc0a029d8e32a72775..c0792b20792f1547fb4335e170a5a7b240d6511f 100644
--- a/content/child/child_process.cc
+++ b/content/child/child_process.cc
@@ -103,6 +103,12 @@ void ChildProcess::ReleaseProcess() {
     main_thread_->OnProcessFinalRelease();
 }
 
+void ChildProcess::SetIOThreadAffinity(
+    base::ThreadPriority io_thread_priority) {
+  DCHECK(main_thread_.get());
+  main_thread_->SetThreadAffinity(io_thread_.GetThreadId(), io_thread_priority);
+}
+
 ChildProcess* ChildProcess::current() {
   return g_lazy_tls.Pointer()->Get();
 }