base: Move renderer threads to the appropriate cpuset.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 4170eb015a85be8cacdf8eb6db9dfa51d67abd81..770c78fc5669ab812da8dad083648f8cc412fe6c 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -855,6 +855,11 @@ void RenderThreadImpl::Init(
   GetRemoteInterfaces()->GetInterface(
       mojo::GetProxy(&storage_partition_service_));
 
+  ChildProcess::current()->SetIOThreadAffinity(base::ThreadPriority::DISPLAY);
+  ChildThreadImpl::current()->SetThreadAffinity(
+      categorized_worker_pool_->background_worker_thread_id(),
+      base::ThreadPriority::BACKGROUND);
+
   is_renderer_suspended_ = false;
 }
 
@@ -1131,6 +1136,8 @@ void RenderThreadImpl::InitializeCompositorThread() {
   compositor_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(base::IgnoreResult(&ThreadRestrictions::SetIOAllowed), false));
+  ChildThreadImpl::current()->SetThreadAffinity(compositor_thread_->threadId(),
+                                                base::ThreadPriority::DISPLAY);
 
   SynchronousInputHandlerProxyClient* synchronous_input_handler_proxy_client =
       nullptr;