Move quic_flags.h from net/quic/core to net/quic/platform and split into api and impl.

net/quic/core/quic_data_writer_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_data_writer.h"
 
 #include <cstdint>
 
 #include "net/quic/core/quic_data_reader.h"
-#include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_utils.h"
+#include "net/quic/platform/api/quic_flags.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 namespace {
 
 class QuicDataWriterTest : public ::testing::TestWithParam<Perspective> {};
 
 TEST_P(QuicDataWriterTest, SanityCheckUFloat16Consts) {
@@ skipping 217 matching lines @@
 
   QuicTag read_chlo;
   QuicDataReader reader(buffer, kBufferLength, GetParam());
   reader.ReadTag(&read_chlo);
   EXPECT_EQ(kCHLO, read_chlo);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net