Add GN build file for third_party speex library.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..5462673feecd48bdfa3b14f9fbc2e00198b17ba3
--- /dev/null
+++ b/BUILD.gn
@@ -0,0 +1,96 @@
+# Copyright 2014 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.
+
+config("speex_config") {
+  include_dirs = [
+    "include",  # Clients expect <speex/speex.h> to be a system header.
+  ]
+}
+
+source_set("speex") {
+  sources = [
+    "libspeex/arch.h",
+    "libspeex/bits.c",
+    "libspeex/cb_search.c",
+    "libspeex/cb_search.h",
+    "libspeex/exc_10_16_table.c",
+    "libspeex/exc_10_32_table.c",
+    "libspeex/exc_20_32_table.c",
+    "libspeex/exc_5_256_table.c",
+    "libspeex/exc_5_64_table.c",
+    "libspeex/exc_8_128_table.c",
+    "libspeex/filters.c",
+    "libspeex/filters.h",
+    "libspeex/gain_table.c",
+    "libspeex/gain_table_lbr.c",
+    "libspeex/hexc_10_32_table.c",
+    "libspeex/hexc_table.c",
+    "libspeex/high_lsp_tables.c",
+    "libspeex/lpc.c",
+    "libspeex/lpc.h",
+    "libspeex/lsp.c",
+    "libspeex/lsp.h",
+    "libspeex/lsp_tables_nb.c",
+    "libspeex/ltp.c",
+    "libspeex/ltp.h",
+    "libspeex/math_approx.h",
+    "libspeex/modes.c",
+    "libspeex/modes.h",
+    "libspeex/modes_wb.c",
+    "libspeex/nb_celp.c",
+    "libspeex/nb_celp.h",
+    "libspeex/os_support.h",
+    "libspeex/pseudofloat.h",
+    "libspeex/quant_lsp.c",
+    "libspeex/quant_lsp.h",
+    "libspeex/sb_celp.c",
+    "libspeex/sb_celp.h",
+    "libspeex/speex.c",
+    "libspeex/speex_callbacks.c",
+    "libspeex/speex_header.c",
+    "libspeex/stack_alloc.h",
+    "libspeex/stereo.c",
+    "libspeex/vbr.c",
+    "libspeex/vbr.h",
+    "libspeex/vq.c",
+    "libspeex/vq.h",
+    "libspeex/window.c",
+    "include/speex/speex.h",
+    "include/speex/speex_bits.h",
+    "include/speex/speex_buffer.h",
+    "include/speex/speex_callbacks.h",
+    "include/speex/speex_echo.h",
+    "include/speex/speex_header.h",
+    "include/speex/speex_jitter.h",
+    "include/speex/speex_preprocess.h",
+    "include/speex/speex_resampler.h",
+    "include/speex/speex_stereo.h",
+    "include/speex/speex_types.h",
+  ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+
+  direct_dependent_configs = [ ":speex_config" ]
+
+  include_dirs = [
+    "libspeex",
+  ]
+
+  defines = [
+    "FLOATING_POINT",
+    "EXPORT=",
+    "USE_ALLOCA",
+    "inline=__inline",
+  ]
+
+  cflags = []
+
+  if (is_win) {
+    cflags += [
+      "/wd4244",
+      "/wd4305",
+    ]
+  }
+}