Refactor QUICHE platform flag accessors.

Move reloadable and restart flags accessor implementations from http2, quic, and
spdy platform directories to quiche/common/platform, removing some code
duplication, and making all accessors available from all three components.

Flag count macros, protocol flags, and flag saver are not touched by this CL.

PiperOrigin-RevId: 348657424
Change-Id: I5a2bbbb66c62bf920454e6b5bbbf41a3b5f54312

common/platform/api/quiche_flags.h

diff --git a/common/platform/api/quiche_flags.h b/common/platform/api/quiche_flags.h
new file mode 100644
index 0000000..83db9d0
--- /dev/null
+++ b/common/platform/api/quiche_flags.h
@@ -0,0 +1,21 @@
+// 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_API_QUICHE_FLAGS_H_
+#define QUICHE_COMMON_PLATFORM_API_QUICHE_FLAGS_H_
+
+#include "net/quiche/common/platform/impl/quiche_flags_impl.h"
+
+#define GetQuicheReloadableFlag(module, flag) \
+  GetQuicheReloadableFlagImpl(module, flag)
+#define SetQuicheReloadableFlag(module, flag, value) \
+  SetQuicheReloadableFlagImpl(module, flag, value)
+#define GetQuicheRestartFlag(module, flag) \
+  GetQuicheRestartFlagImpl(module, flag)
+#define SetQuicheRestartFlag(module, flag, value) \
+  SetQuicheRestartFlagImpl(module, flag, value)
+#define GetQuicheFlag(flag) GetQuicheFlagImpl(flag)
+#define SetQuicheFlag(flag, value) SetQuicheFlagImpl(flag, value)
+
+#endif  // QUICHE_COMMON_PLATFORM_API_QUICHE_FLAGS_H_

http2/platform/api/http2_flags.h

diff --git a/http2/platform/api/http2_flags.h b/http2/platform/api/http2_flags.h
index 08f95da..df84e34 100644
--- a/http2/platform/api/http2_flags.h
+++ b/http2/platform/api/http2_flags.h
@@ -5,10 +5,15 @@
 #ifndef QUICHE_HTTP2_PLATFORM_API_HTTP2_FLAGS_H_
 #define QUICHE_HTTP2_PLATFORM_API_HTTP2_FLAGS_H_
 
-#include "net/http2/platform/impl/http2_flags_impl.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_flags.h"
 
-#define GetHttp2ReloadableFlag(flag) GetHttp2ReloadableFlagImpl(flag)
+#define GetHttp2ReloadableFlag(flag) GetQuicheReloadableFlag(http2, flag)
 #define SetHttp2ReloadableFlag(flag, value) \
-  SetHttp2ReloadableFlagImpl(flag, value)
+  SetQuicheReloadableFlag(http2, flag, value)
+#define GetHttp2RestartFlag(flag) GetQuicheRestartFlag(http2, flag)
+#define SetHttp2RestartFlag(flag, value) \
+  SetQuicheRestartFlag(http2, flag, value)
+#define GetHttp2Flag(flag) GetQuicheFlag(flag)
+#define SetHttp2Flag(flag, value) SetQuicheFlag(flag, value)
 
 #endif  // QUICHE_HTTP2_PLATFORM_API_HTTP2_FLAGS_H_

quic/platform/api/quic_flags.h

diff --git a/quic/platform/api/quic_flags.h b/quic/platform/api/quic_flags.h
index 302036f..3b98037 100644
--- a/quic/platform/api/quic_flags.h
+++ b/quic/platform/api/quic_flags.h
@@ -10,19 +10,21 @@
 
 #include "net/quic/platform/impl/quic_flags_impl.h"
 
+#include "net/third_party/quiche/src/common/platform/api/quiche_flags.h"
+
+#define GetQuicReloadableFlag(flag) GetQuicheReloadableFlag(quic, flag)
+#define SetQuicReloadableFlag(flag, value) \
+  SetQuicheReloadableFlag(quic, flag, value)
+#define GetQuicRestartFlag(flag) GetQuicheRestartFlag(quic, flag)
+#define SetQuicRestartFlag(flag, value) SetQuicheRestartFlag(quic, flag, value)
+#define GetQuicFlag(flag) GetQuicheFlag(flag)
+#define SetQuicFlag(flag, value) SetQuicheFlag(flag, value)
+
 // Define a command-line flag that can be automatically set via
 // QuicParseCommandLineFlags().
 #define DEFINE_QUIC_COMMAND_LINE_FLAG(type, name, default_value, help) \
   DEFINE_QUIC_COMMAND_LINE_FLAG_IMPL(type, name, default_value, help)
 
-#define GetQuicReloadableFlag(flag) GetQuicReloadableFlagImpl(flag)
-#define SetQuicReloadableFlag(flag, value) \
-  SetQuicReloadableFlagImpl(flag, value)
-#define GetQuicRestartFlag(flag) GetQuicRestartFlagImpl(flag)
-#define SetQuicRestartFlag(flag, value) SetQuicRestartFlagImpl(flag, value)
-#define GetQuicFlag(flag) GetQuicFlagImpl(flag)
-#define SetQuicFlag(flag, value) SetQuicFlagImpl(flag, value)
-
 namespace quic {
 
 // Parses command-line flags, setting flag variables defined using

spdy/platform/api/spdy_flags.h

diff --git a/spdy/platform/api/spdy_flags.h b/spdy/platform/api/spdy_flags.h
index f3446d9..35eaf92 100644
--- a/spdy/platform/api/spdy_flags.h
+++ b/spdy/platform/api/spdy_flags.h
@@ -5,9 +5,14 @@
 #ifndef QUICHE_SPDY_PLATFORM_API_SPDY_FLAGS_H_
 #define QUICHE_SPDY_PLATFORM_API_SPDY_FLAGS_H_
 
-#include "net/spdy/platform/impl/spdy_flags_impl.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_flags.h"
 
-#define GetSpdyReloadableFlag(flag) GetSpdyReloadableFlagImpl(flag)
-#define GetSpdyRestartFlag(flag) GetSpdyRestartFlagImpl(flag)
+#define GetSpdyReloadableFlag(flag) GetQuicheReloadableFlag(spdy, flag)
+#define SetSpdyReloadableFlag(flag, value) \
+  SetQuicheReloadableFlag(spdy, flag, value)
+#define GetSpdyRestartFlag(flag) GetQuicheRestartFlag(spdy, flag)
+#define SetSpdyRestartFlag(flag, value) SetQuicheRestartFlag(spdy, flag, value)
+#define GetSpdyFlag(flag) GetQuicheFlag(flag)
+#define SetSpdyFlag(flag, value) SetQuicheFlag(flag, value)
 
 #endif  // QUICHE_SPDY_PLATFORM_API_SPDY_FLAGS_H_