Add QUIC v40 which will be used to include changes:

net/quic/core/quic_version_manager_test.cc

Index: net/quic/core/quic_version_manager_test.cc
diff --git a/net/quic/core/quic_version_manager_test.cc b/net/quic/core/quic_version_manager_test.cc
index 89f7222e7aaf826eaaffae509ea6b4ba94bcc13e..6a3f9c13b19a0984cb973dad883d55e30f580245 100644
--- a/net/quic/core/quic_version_manager_test.cc
+++ b/net/quic/core/quic_version_manager_test.cc
@@ -16,6 +16,7 @@ namespace {
 class QuicVersionManagerTest : public QuicTest {};
 
 TEST_F(QuicVersionManagerTest, QuicVersionManager) {
+  SetQuicFlag(&FLAGS_quic_enable_version_40, false);
   FLAGS_quic_reloadable_flag_quic_enable_version_39 = false;
   FLAGS_quic_reloadable_flag_quic_enable_version_38 = false;
   QuicVersionManager manager(AllSupportedVersions());
@@ -41,14 +42,24 @@ TEST_F(QuicVersionManagerTest, QuicVersionManager) {
   EXPECT_EQ(QUIC_VERSION_36, manager.GetSupportedVersions()[3]);
   EXPECT_EQ(QUIC_VERSION_35, manager.GetSupportedVersions()[4]);
 
+  SetQuicFlag(&FLAGS_quic_enable_version_40, true);
+  ASSERT_EQ(6u, manager.GetSupportedVersions().size());
+  EXPECT_EQ(QUIC_VERSION_40, manager.GetSupportedVersions()[0]);
+  EXPECT_EQ(QUIC_VERSION_39, manager.GetSupportedVersions()[1]);
+  EXPECT_EQ(QUIC_VERSION_38, manager.GetSupportedVersions()[2]);
+  EXPECT_EQ(QUIC_VERSION_37, manager.GetSupportedVersions()[3]);
+  EXPECT_EQ(QUIC_VERSION_36, manager.GetSupportedVersions()[4]);
+  EXPECT_EQ(QUIC_VERSION_35, manager.GetSupportedVersions()[5]);
+
   EXPECT_EQ(FilterSupportedVersions(AllSupportedVersions()),
             manager.GetSupportedVersions());
-  ASSERT_EQ(5u, manager.GetSupportedVersions().size());
-  EXPECT_EQ(QUIC_VERSION_39, manager.GetSupportedVersions()[0]);
-  EXPECT_EQ(QUIC_VERSION_38, manager.GetSupportedVersions()[1]);
-  EXPECT_EQ(QUIC_VERSION_37, manager.GetSupportedVersions()[2]);
-  EXPECT_EQ(QUIC_VERSION_36, manager.GetSupportedVersions()[3]);
-  EXPECT_EQ(QUIC_VERSION_35, manager.GetSupportedVersions()[4]);
+  ASSERT_EQ(6u, manager.GetSupportedVersions().size());
+  EXPECT_EQ(QUIC_VERSION_40, manager.GetSupportedVersions()[0]);
+  EXPECT_EQ(QUIC_VERSION_39, manager.GetSupportedVersions()[1]);
+  EXPECT_EQ(QUIC_VERSION_38, manager.GetSupportedVersions()[2]);
+  EXPECT_EQ(QUIC_VERSION_37, manager.GetSupportedVersions()[3]);
+  EXPECT_EQ(QUIC_VERSION_36, manager.GetSupportedVersions()[4]);
+  EXPECT_EQ(QUIC_VERSION_35, manager.GetSupportedVersions()[5]);
 }
 
 }  // namespace