QUIC WINDOW_UPDATE and BLOCKED frames instigate ACKs.

net/quic/quic_connection_test.cc

Index: net/quic/quic_connection_test.cc
diff --git a/net/quic/quic_connection_test.cc b/net/quic/quic_connection_test.cc
index 2100368813420ce3cd83ebae1108eabc5849540f..4a71bc1fccd25dc907aec2205fe4ba59a0d553c9 100644
--- a/net/quic/quic_connection_test.cc
+++ b/net/quic/quic_connection_test.cc
@@ -3746,6 +3746,29 @@ TEST_P(QuicConnectionTest, Pacing) {
   EXPECT_FALSE(server.sent_packet_manager().using_pacing());
 }
 
+TEST_P(QuicConnectionTest, ControlFramesInstigateAcks) {
+  if (version() < QUIC_VERSION_14) {
+    return;
+  }
+  EXPECT_CALL(visitor_, OnSuccessfulVersionNegotiation(_));
+
+  // Send a WINDOW_UPDATE frame.
+  QuicWindowUpdateFrame window_update;
+  EXPECT_CALL(visitor_, OnWindowUpdateFrames(_));
+  ProcessFramePacket(QuicFrame(&window_update));
+
+  // Ensure that this has caused the ACK alarm to be set.
+  QuicAlarm* ack_alarm = QuicConnectionPeer::GetAckAlarm(&connection_);
+  EXPECT_TRUE(ack_alarm->IsSet());
+
+  // Cancel alarm, and try again with BLOCKED frame.
+  ack_alarm->Cancel();
+  QuicBlockedFrame blocked;
+  EXPECT_CALL(visitor_, OnBlockedFrames(_));
+  ProcessFramePacket(QuicFrame(&blocked));
+  EXPECT_TRUE(ack_alarm->IsSet());
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace net