[gn] Fix precompile_tools=True (attempt 2)

Turns out that dart compile exe --depfile produces
depfile which does not work with ninja because
it uses absolute path to the output file
instead of using relative path.

So we can't use it directly and need to fix
depfile.

TEST=manually

Change-Id: I1aadfd5079cc38d392933f9afe333f63407bb295
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/435680
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>

utils/BUILD.gn

@@ -8,7 +8,7 @@ import("../sdk_args.gni")
 _dart_root = get_path_info("..", "abspath")
 
 template("aot_compile_using_prebuilt_sdk") {
-  prebuilt_dart_action(target_name) {
+  action(target_name) {
     forward_variables_from(invoker,
                            [
                              "deps",
@@ -17,24 +17,31 @@ template("aot_compile_using_prebuilt_sdk") {
                              "visibility",
                            ])
 
+    script = "$_dart_root/build/gn_dart_compile_exe.py"
+
     inputs = [
       invoker.entry_point,
       invoker.package_config,
     ]
+
     outputs = [ invoker.output ]
+
     depfile = invoker.output + ".d"
 
+    # TODO(vegorov): support RBE by using rewrapper script.
     args = [
-      "compile",
-      "exe",
+      "--dart-sdk",
+      rebase_path("$_dart_root/tools/sdks/dart-sdk", root_build_dir),
+      "--sdk-hash",
+      "$sdk_hash",
+      "--entry-point",
+      rebase_path(invoker.entry_point, root_build_dir),
+      "--output",
+      rebase_path(invoker.output, root_build_dir),
       "--packages",
       rebase_path(invoker.package_config, root_build_dir),
-      "-Dsdk_hash=$sdk_hash",
       "--depfile",
       rebase_path(depfile, root_build_dir),
-      "-o",
-      rebase_path(invoker.output, root_build_dir),
-      rebase_path(invoker.entry_point, root_build_dir),
     ]
   }
 }