Archive windows gen_snapshot.exe. (#35414)

* Archive windows gen_snapshot.exe.

This is required to enable engine_v2 recipes for windows platform.

Bug: flutter/flutter#81855

* Add dep to generate gen_snapshot.exe.

* Use target platform name rather than host.

* Use prebuilt_arch.

* Use platform_name instead of is_win.

* Remove android check.

* Fix output name.

* Separate platform and cpu in name.

* Remove failing line.

* Use dart_target_arch rather than target_cpu in windows.

* Add dart_target_arch to scope.

* Add support for android_cpu.

* Fix android_cpu variable name.

* Rebase to ToT

* Try to use target cpu directly.

* Use host os instead of is_win.

* Build engine artifacts for win.

* Update build/archives/BUILD.gn

Co-authored-by: Zachary Anderson <[email protected]>

* Update build/archives/BUILD.gn

Co-authored-by: Zachary Anderson <[email protected]>

* Update build/archives/BUILD.gn

Co-authored-by: Zachary Anderson <[email protected]>

Co-authored-by: Zachary Anderson <[email protected]>

Author: godofredoc

build/archives/BUILD.gn

@@ -300,3 +300,16 @@ if (is_mac) {
     ]
   }
 }
+
+if (host_os == "win") {
+  zip_bundle("archive_win_gen_snapshot") {
+    deps = [ "//flutter:gen_snapshot" ]
+    output = "$full_target_platform_name-$flutter_runtime_mode/windows-x64.zip"
+    files = [
+      {
+        source = "$root_out_dir/gen_snapshot/gen_snapshot.exe"
+        destination = "gen_snapshot.exe"
+      },
+    ]
+  }
+}

common/config.gni

@@ -132,4 +132,4 @@ if (flutter_prebuilt_dart_sdk) {
 # see https://github.com/flutter/flutter/issues/74322
 build_engine_artifacts =
     current_toolchain == host_toolchain ||
-    (is_linux && !is_chromeos && current_cpu != "arm") || is_mac
+    (is_linux && !is_chromeos && current_cpu != "arm") || is_mac || is_win