[Net] Propagate priority changes from URLRequest to HttpTransaction

net/url_request/url_request_job.h

Index: net/url_request/url_request_job.h
diff --git a/net/url_request/url_request_job.h b/net/url_request/url_request_job.h
index 56e1307cb041b5a051cc4aec8115d51a291bf97a..ae956733ee700aae6e3759ee6b43b62c2e9adfbe 100644
--- a/net/url_request/url_request_job.h
+++ b/net/url_request/url_request_job.h
@@ -17,6 +17,7 @@
 #include "net/base/host_port_pair.h"
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
+#include "net/base/request_priority.h"
 #include "net/base/upload_progress.h"
 #include "net/cookies/canonical_cookie.h"
 
@@ -53,9 +54,14 @@ class NET_EXPORT URLRequestJob : public base::RefCounted<URLRequestJob>,
   // Job types supporting upload data will override this.
   virtual void SetUpload(UploadDataStream* upload_data_stream);
 
-  // Sets extra request headers for Job types that support request headers.
+  // Sets extra request headers for Job types that support request
+  // headers. Called once before Start() is called.
   virtual void SetExtraRequestHeaders(const HttpRequestHeaders& headers);
 
+  // Sets the priority of the job. Called once before Start() is
+  // called, but also when the priority of the parent request changes.
+  virtual void SetPriority(RequestPriority priority);
+
   // If any error occurs while starting the Job, NotifyStartError should be
   // called.
   // This helps ensure that all errors follow more similar notification code