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 eb7094a55a274d2384e6dd7d58d1202cb82a859a..494064a4547b67788358b1670c747e1638c1c410 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -858,6 +858,11 @@ void RenderThreadImpl::Init(
   time_zone_monitor->AddClient(
       time_zone_monitor_binding_.CreateInterfacePtrAndBind());
 
+  ChildProcess::current()->SetIOThreadPriority(base::ThreadPriority::DISPLAY);
+  ChildThreadImpl::current()->SetThreadPriority(
+      categorized_worker_pool_->background_worker_thread_id(),
+      base::ThreadPriority::BACKGROUND);
+
   is_renderer_suspended_ = false;
 }
 
@@ -1134,6 +1139,8 @@ void RenderThreadImpl::InitializeCompositorThread() {
   compositor_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(base::IgnoreResult(&ThreadRestrictions::SetIOAllowed), false));
+  ChildThreadImpl::current()->SetThreadPriority(compositor_thread_->threadId(),
+                                                base::ThreadPriority::DISPLAY);
 
   SynchronousInputHandlerProxyClient* synchronous_input_handler_proxy_client =
       nullptr;