Add a cap of six in-flight requests per host to the ResourceScheduler

net/base/priority_queue_unittest.cc

Index: net/base/priority_queue_unittest.cc
diff --git a/net/base/priority_queue_unittest.cc b/net/base/priority_queue_unittest.cc
index 0baff6e005ce6c265fca489cf516dada331b86ea..7ac1fef0bfad428d66bc5a7defd7b9373b7d0051 100644
--- a/net/base/priority_queue_unittest.cc
+++ b/net/base/priority_queue_unittest.cc
@@ -105,6 +105,29 @@ TEST_F(PriorityQueueTest, LastMaxOrderErase) {
   CheckEmpty();
 }
 
+TEST_F(PriorityQueueTest, NextHighestIteration) {
+  PriorityQueue<int>::Pointer current = queue_.FirstMax();
+  for (size_t i = 0; i < kNumElements; ++i) {
+    EXPECT_FALSE(current.is_null());
+    EXPECT_EQ(kFirstMaxOrder[i], current.value());
+    current = queue_.NextHighest(current);
+  }
+  EXPECT_TRUE(current.is_null());
+}
+
+TEST_F(PriorityQueueTest, NextHighestIterationWithDeletion) {
+  PriorityQueue<int>::Pointer current = queue_.FirstMax();
+  for (size_t i = 0; i < kNumElements; ++i) {
+    EXPECT_FALSE(current.is_null());
+    EXPECT_EQ(kFirstMaxOrder[i], current.value());
+    PriorityQueue<int>::Pointer next = queue_.NextHighest(current);
+    queue_.Erase(current);
+    current = next;
+  }
+  EXPECT_TRUE(current.is_null());
+  CheckEmpty();
+}
+
 TEST_F(PriorityQueueTest, EraseFromMiddle) {
   queue_.Erase(pointers_[2]);
   queue_.Erase(pointers_[3]);