base: Move renderer threads to the appropriate cpuset.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 9e2aa1c63738e4396a14e26bb2b503987dfa7b76..8c96f8504fcaa89e6a44369129fc0c97b9d21a98 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -204,6 +204,8 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
         OnAllocateLockedDiscardableSharedMemory)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_DeletedDiscardableSharedMemory,
                         OnDeletedDiscardableSharedMemory)
+    IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SetThreadAffinity,
+                        OnSetThreadAffinity)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(RenderProcessHostMsg_Keygen, OnKeygen)
     IPC_MESSAGE_HANDLER(RenderProcessHostMsg_DidGenerateCacheableMetadata,
                         OnCacheableMetadataAvailable)
@@ -414,6 +416,24 @@ void RenderMessageFilter::OnDeletedDiscardableSharedMemory(
           this, id));
 }
 
+void RenderMessageFilter::SetThreadAffinityOnFileThread(
+    base::PlatformThreadId id,
+    base::ThreadPriority priority) {
+#if defined(OS_LINUX)
+  base::PlatformThread::SetThreadAffinity(
+      peer_pid() + id + 1,  // Magic conversion to global Thread ID.
+      priority);
+#endif
+}
+
+void RenderMessageFilter::OnSetThreadAffinity(base::PlatformThreadId id,
+                                              base::ThreadPriority priority) {
+  BrowserThread::PostTask(
+      BrowserThread::FILE_USER_BLOCKING, FROM_HERE,
+      base::Bind(&RenderMessageFilter::SetThreadAffinityOnFileThread, this, id,
+                 priority));
+}
+
 void RenderMessageFilter::OnCacheableMetadataAvailable(
     const GURL& url,
     base::Time expected_response_time,