Add the 'dirs' crate, enable the required 'winapi' features

BUILD.gn

@@ -48,6 +48,7 @@ main_extern = [
   "$rust_build:tokio",
   "$rust_build:url",
   "$rust_build:remove_dir_all",
+  "$rust_build:dirs",
   "//build_extra/flatbuffers/rust:flatbuffers",
   ":msg_rs",
 ]

Cargo.toml

@@ -17,4 +17,4 @@ tokio = "0.1"
 hyper = "0.12.8"
 hyper-rustls = "0.14.0"
 flatbuffers = { path = "third_party/flatbuffers/rust/flatbuffers/" }
-
+dirs = "1.0.3"

build_extra/rust/BUILD.gn

@@ -103,6 +103,7 @@ rust_crate("winapi") {
     "basetsd",
     "cfg",
     "cfgmgr32",
+    "combaseapi",
     "errhandlingapi",
     "excpt",
     "fileapi",
@@ -110,6 +111,7 @@ rust_crate("winapi") {
     "handleapi",
     "inaddr",
     "in6addr",
+    "knownfolders",
     "ktmtypes",
     "libloaderapi",
     "lsalookup",
@@ -119,15 +121,24 @@ rust_crate("winapi") {
     "ntdef",
     "ntsecapi",
     "ntstatus",
+    "objbase",
+    "objidl",
+    "objidlbase",
     "processthreadsapi",
     "profileapi",
+    "propidl",
     "qos",
+    "rpc",
+    "rpcdce",
     "rpcndr",
+    "shlobj",
+    "shtypes",
     "sspi",
     "std",
     "subauth",
     "sysinfoapi",
     "timezoneapi",
+    "unknwnbase",
     "vadefs",
     "vcruntime",
     "winbase",
@@ -598,6 +609,14 @@ rust_crate("hyper_rustls") {
   ]
 }
 
+rust_crate("dirs") {
+  source_root = "$registry_github/dirs-1.0.3/src/lib.rs"
+  extern = [
+    ":libc",
+    ":winapi",
+  ]
+}
+
 ring_root = "$registry_github/ring-0.13.2/"
 
 component("ring_primitives") {

third_party

@@ -1 +1 @@
-Subproject commit ff175a4d08d5d5154ca6313bac53540dda063fe3
+Subproject commit 3e948f58ee654fdb2aa3898664962a52d648dc1a