base: Allow renderer thread priorities to be changed.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 379c82157f17b976209cd8c93f25eb1204883f5d..95b7f7abd959828a0ff0440b0138a0533cf8d303 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -175,6 +175,13 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
   void DeletedDiscardableSharedMemoryOnFileThread(DiscardableSharedMemoryId id);
   void OnDeletedDiscardableSharedMemory(DiscardableSharedMemoryId id);
 
+#if defined(OS_LINUX)
+  void SetThreadPriorityOnFileThread(base::PlatformThreadId ns_tid,
+                                     base::ThreadPriority priority);
+  void OnSetThreadPriority(base::PlatformThreadId ns_tid,
+                           base::ThreadPriority priority);
+#endif
+
   void OnCacheableMetadataAvailable(const GURL& url,
                                     base::Time expected_response_time,
                                     const std::vector<char>& data);