base: Move renderer threads to the appropriate cpuset.

content/common/child_process_messages.h

Index: content/common/child_process_messages.h
diff --git a/content/common/child_process_messages.h b/content/common/child_process_messages.h
index a0fbc17ec6dd573058f61445e1bb2fa923550910..757630ecf756495b2ccb95388d79424d2a1025e2 100644
--- a/content/common/child_process_messages.h
+++ b/content/common/child_process_messages.h
@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "base/memory/shared_memory.h"
+#include "base/threading/platform_thread.h"
 #include "base/tracked_objects.h"
 #include "base/values.h"
 #include "build/build_config.h"
@@ -66,6 +67,9 @@ IPC_STRUCT_TRAITS_BEGIN(tracked_objects::ProcessDataSnapshot)
   IPC_STRUCT_TRAITS_MEMBER(process_id)
 IPC_STRUCT_TRAITS_END()
 
+IPC_ENUM_TRAITS_MAX_VALUE(base::ThreadPriority,
+                          base::ThreadPriority::REALTIME_AUDIO)
+
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
@@ -211,3 +215,8 @@ IPC_SYNC_MESSAGE_CONTROL2_1(
 // memory.
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_DeletedDiscardableSharedMemory,
                      content::DiscardableSharedMemoryId)
+
+// Asks the browser to change the affinity of thread based on priority.
+IPC_MESSAGE_CONTROL2(ChildProcessHostMsg_SetThreadAffinity,
+                     base::PlatformThreadId,
+                     base::ThreadPriority)