Provide default implementation for QUICHE flags
The default version is copied from Chromium, as it can be built standalone. Unfortunately, we cannot build this inside google3 as the .h file it uses is autogenerated by Copybara (I tested it manually in my local QUICHE checkout, and it did build).
PiperOrigin-RevId: 428622438
diff --git a/common/platform/api/quiche_flags.h b/common/platform/api/quiche_flags.h
index 83db9d0..8b26edb 100644
--- a/common/platform/api/quiche_flags.h
+++ b/common/platform/api/quiche_flags.h
@@ -5,7 +5,7 @@
#ifndef QUICHE_COMMON_PLATFORM_API_QUICHE_FLAGS_H_
#define QUICHE_COMMON_PLATFORM_API_QUICHE_FLAGS_H_
-#include "net/quiche/common/platform/impl/quiche_flags_impl.h"
+#include "quiche_platform_impl/quiche_flags_impl.h"
#define GetQuicheReloadableFlag(module, flag) \
GetQuicheReloadableFlagImpl(module, flag)
diff --git a/common/platform/default/quiche_platform_impl/quiche_flags_impl.cc b/common/platform/default/quiche_platform_impl/quiche_flags_impl.cc
new file mode 100644
index 0000000..b68f93d
--- /dev/null
+++ b/common/platform/default/quiche_platform_impl/quiche_flags_impl.cc
@@ -0,0 +1,9 @@
+// Copyright 2020 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 "quiche_platform_impl/quiche_flags_impl.h"
+
+#define QUIC_FLAG(flag, value) bool flag = value;
+#include "quic/core/quic_flags_list.h"
+#undef QUIC_FLAG
diff --git a/common/platform/default/quiche_platform_impl/quiche_flags_impl.h b/common/platform/default/quiche_platform_impl/quiche_flags_impl.h
new file mode 100644
index 0000000..8d655ed
--- /dev/null
+++ b/common/platform/default/quiche_platform_impl/quiche_flags_impl.h
@@ -0,0 +1,42 @@
+// Copyright 2020 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.
+
+#ifndef QUICHE_COMMON_PLATFORM_DEFAULT_QUICHE_PLATFORM_IMPL_QUICHE_FLAGS_IMPL_H_
+#define QUICHE_COMMON_PLATFORM_DEFAULT_QUICHE_PLATFORM_IMPL_QUICHE_FLAGS_IMPL_H_
+
+#include <cstdint>
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "common/platform/api/quiche_export.h"
+
+#define QUIC_FLAG(flag, value) QUICHE_EXPORT_PRIVATE extern bool flag;
+#include "quic/core/quic_flags_list.h"
+#undef QUIC_FLAG
+
+inline bool GetQuicheFlagImpl(bool flag) { return flag; }
+inline int32_t GetQuicheFlagImpl(int32_t flag) { return flag; }
+inline int64_t GetQuicheFlagImpl(int64_t flag) { return flag; }
+inline uint64_t GetQuicheFlagImpl(uint64_t flag) { return flag; }
+inline double GetQuicheFlagImpl(double flag) { return flag; }
+inline std::string GetQuicheFlagImpl(const std::string& flag) { return flag; }
+#define SetQuicheFlagImpl(flag, value) ((flag) = (value))
+
+// ------------------------------------------------------------------------
+// QUIC feature flags implementation.
+// ------------------------------------------------------------------------
+#define QUICHE_RELOADABLE_FLAG(flag) FLAGS_quic_reloadable_flag_##flag
+#define QUICHE_RESTART_FLAG(flag) FLAGS_quic_restart_flag_##flag
+#define GetQuicheReloadableFlagImpl(module, flag) \
+ GetQuicheFlag(QUICHE_RELOADABLE_FLAG(flag))
+#define SetQuicheReloadableFlagImpl(module, flag, value) \
+ SetQuicheFlag(QUICHE_RELOADABLE_FLAG(flag), value)
+#define GetQuicheRestartFlagImpl(module, flag) \
+ GetQuicheFlag(QUICHE_RESTART_FLAG(flag))
+#define SetQuicheRestartFlagImpl(module, flag, value) \
+ SetQuicheFlag(QUICHE_RESTART_FLAG(flag), value)
+
+#endif // QUICHE_COMMON_PLATFORM_DEFAULT_QUICHE_PLATFORM_IMPL_QUICHE_FLAGS_IMPL_H_
