Add a new priority level, THROTTLED, below IDLE.

net/base/prioritized_dispatcher_unittest.cc

Index: net/base/prioritized_dispatcher_unittest.cc
diff --git a/net/base/prioritized_dispatcher_unittest.cc b/net/base/prioritized_dispatcher_unittest.cc
index fffb47f252ce990accc8309f01510f121fcefe49..7d0b90ea58fb9d9c7bb86d51106a887dfbc35dfd 100644
--- a/net/base/prioritized_dispatcher_unittest.cc
+++ b/net/base/prioritized_dispatcher_unittest.cc
@@ -20,8 +20,10 @@ namespace {
 
 // We rely on the priority enum values being sequential having starting at 0,
 // and increasing for higher priorities.
-static_assert(MINIMUM_PRIORITY == 0u && MINIMUM_PRIORITY == IDLE &&
-                  IDLE < LOWEST && LOWEST < HIGHEST &&
+static_assert(MINIMUM_PRIORITY == 0u && MINIMUM_PRIORITY == THROTTLED &&
+                  THROTTLED < IDLE &&
+                  IDLE < LOWEST &&
+                  LOWEST < HIGHEST &&
                   HIGHEST <= MAXIMUM_PRIORITY,
               "priority indexes incompatible");