Convert some third_party deps to GN

tools/gn/secondary/third_party/ots/BUILD.gn

Index: tools/gn/secondary/third_party/ots/BUILD.gn
diff --git a/tools/gn/secondary/third_party/ots/BUILD.gn b/tools/gn/secondary/third_party/ots/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d1d14ef8cc72155a5236fcb92ae81a847d876747
--- /dev/null
+++ b/tools/gn/secondary/third_party/ots/BUILD.gn
@@ -0,0 +1,90 @@
+# Copyright (c) 2013 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("ots_config") {
+  include_dirs = [ "include" ]
+}
+
+source_set("ots") {
+  sources = [
+    "include/ots-memory-stream.h",
+    "include/opentype-sanitiser.h",
+    "src/cff.cc",
+    "src/cff.h",
+    "src/cff_type2_charstring.cc",
+    "src/cff_type2_charstring.h",
+    "src/cmap.cc",
+    "src/cmap.h",
+    "src/cvt.cc",
+    "src/cvt.h",
+    "src/fpgm.cc",
+    "src/fpgm.h",
+    "src/gasp.cc",
+    "src/gasp.h",
+    "src/gdef.cc",
+    "src/gdef.h",
+    "src/glyf.cc",
+    "src/glyf.h",
+    "src/gpos.cc",
+    "src/gpos.h",
+    "src/gsub.cc",
+    "src/gsub.h",
+    "src/hdmx.cc",
+    "src/hdmx.h",
+    "src/head.cc",
+    "src/head.h",
+    "src/hhea.cc",
+    "src/hhea.h",
+    "src/hmtx.cc",
+    "src/hmtx.h",
+    "src/kern.cc",
+    "src/kern.h",
+    "src/layout.cc",
+    "src/layout.h",
+    "src/loca.cc",
+    "src/loca.h",
+    "src/ltsh.cc",
+    "src/ltsh.h",
+    "src/maxp.cc",
+    "src/maxp.h",
+    "src/math.cc",
+    "src/math_.h",
+    "src/metrics.cc",
+    "src/metrics.h",
+    "src/name.cc",
+    "src/name.h",
+    "src/os2.cc",
+    "src/os2.h",
+    "src/ots.cc",
+    "src/ots.h",
+    "src/post.cc",
+    "src/post.h",
+    "src/prep.cc",
+    "src/prep.h",
+    "src/vdmx.cc",
+    "src/vdmx.h",
+    "src/vhea.cc",
+    "src/vhea.h",
+    "src/vmtx.cc",
+    "src/vmtx.h",
+    "src/vorg.cc",
+    "src/vorg.h",
+    "src/woff2.cc",
+    "src/woff2.h",
+  ]
+
+  direct_dependent_configs = [ ":ots_config" ]
+
+  deps = [
+    "//third_party/brotli",
+    "//third_party/zlib",
+  ]
+
+  if (is_win) {
+    cflags = [
+      "/wd4267",  # Conversion from size_t to 'type'.
+      "/wd4334",  # 32-bit shift implicitly converted to 64-bits.
+    ]
+  }
+}