[ResourceScheduler] Throttle H2/QUIC requests just like we do for 1.1

content/browser/loader/resource_scheduler.h

Index: content/browser/loader/resource_scheduler.h
diff --git a/content/browser/loader/resource_scheduler.h b/content/browser/loader/resource_scheduler.h
index 0b4218227b9721dcf0416ebdcd2c35cc5a8e74bb..4a0721edfa9fd1149c2f69fd7cfcf7e12801055e 100644
--- a/content/browser/loader/resource_scheduler.h
+++ b/content/browser/loader/resource_scheduler.h
@@ -137,6 +137,10 @@ class CONTENT_EXPORT ResourceScheduler : public base::NonThreadSafe {
   size_t max_num_delayable_requests_;
   RequestSet unowned_requests_;
 
+  // True if requests to servers that support priorities (e.g., H2/QUIC) can
+  // be delayed.
+  bool priority_requests_delayable_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceScheduler);
 };