Part of QUIC v39 change: 1) do not ack acks. 2) Send a WINDOW_UPDATE frame every 20 packets which d…

net/tools/quic/end_to_end_test.cc

Index: net/tools/quic/end_to_end_test.cc
diff --git a/net/tools/quic/end_to_end_test.cc b/net/tools/quic/end_to_end_test.cc
index aead33ad2735e599576a30db6af4401c0240ba5f..53430f590c26c5b30610c42a17a949b2d4698512 100644
--- a/net/tools/quic/end_to_end_test.cc
+++ b/net/tools/quic/end_to_end_test.cc
@@ -3020,6 +3020,48 @@ TEST_P(EndToEndTest, WayTooLongRequestHeaders) {
             client_->connection_error());
 }
 
+class WindowUpdateObserver : public QuicConnectionDebugVisitor {
+ public:
+  WindowUpdateObserver() : num_window_update_frames_(0) {}
+
+  size_t num_window_update_frames() const { return num_window_update_frames_; }
+
+  void OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) override {
+    ++num_window_update_frames_;
+  }
+
+ private:
+  size_t num_window_update_frames_;
+};
+
+TEST_P(EndToEndTest, WindowUpdateInAck) {
+  FLAGS_quic_reloadable_flag_quic_enable_version_38 = true;
+  FLAGS_quic_enable_version_39 = true;
+  ASSERT_TRUE(Initialize());
+  EXPECT_TRUE(client_->client()->WaitForCryptoHandshakeConfirmed());
+  WindowUpdateObserver observer;
+  QuicConnection* client_connection =
+      client_->client()->session()->connection();
+  client_connection->set_debug_visitor(&observer);
+  QuicVersion version = client_connection->version();
+  // 100KB body.
+  string body(100 * 1024, 'a');
+  SpdyHeaderBlock headers;
+  headers[":method"] = "POST";
+  headers[":path"] = "/foo";
+  headers[":scheme"] = "https";
+  headers[":authority"] = server_hostname_;
+
+  EXPECT_EQ(kFooResponseBody,
+            client_->SendCustomSynchronousRequest(headers, body));
+  client_->Disconnect();
+  if (version > QUIC_VERSION_38) {
+    EXPECT_LT(0u, observer.num_window_update_frames());
+  } else {
+    EXPECT_EQ(0u, observer.num_window_update_frames());
+  }
+}
+
 class EndToEndBufferedPacketsTest : public EndToEndTest {
  public:
   void CreateClientWithWriter() override {