[GN] Use the prebuilt toolchain to build analyzer summaries

This will speed up cross-builds.

TO-660

Change-Id: Idb1bf8839ffc3443ff620fbe94b733fe71d6bf84
Reviewed-on: https://dart-review.googlesource.com/30901
Reviewed-by: Siva Annamalai <asiva@google.com>

utils/dartanalyzer/BUILD.gn

@@ -3,6 +3,7 @@
 # BSD-style license that can be found in the LICENSE file.
 
 import("../../build/compiled_action.gni")
+import("../../build/prebuilt_dart_sdk.gni")
 import("../application_snapshot.gni")
 
 group("dartanalyzer") {
@@ -47,8 +48,27 @@ template("generate_summary") {
   assert(defined(invoker.type), "Must specify the summary type")
   type = invoker.type
   assert(type == "spec" || type == "strong")
-  compiled_action(target_name) {
-    tool = "../../runtime/bin:dart"
+  action(target_name) {
+
+    if (!prebuilt_dart_exe_works) {
+      deps = [ "../../runtime/bin:dart_bootstrap($dart_host_toolchain)" ]
+    }
+
+    script = "../../tools/run_dart.py"
+
+    args = []
+    if (!prebuilt_dart_exe_works) {
+      dart_out_dir = get_label_info(
+              "../../runtime/bin:dart_bootstrap($dart_host_toolchain)",
+              "root_out_dir")
+      dart_bootstrap =
+          rebase_path("$dart_out_dir/dart_bootstrap$executable_suffix")
+      args += [
+        "--dart",
+        dart_bootstrap,
+      ]
+    }
+
     inputs = sdk_lib_files + analyzer_files
 
     output = "$root_gen_dir/$type.sum"
@@ -60,7 +80,8 @@ template("generate_summary") {
     build_sdk_summaries =
         rebase_path("../../pkg/analyzer/tool/summary/build_sdk_summaries.dart")
 
-    args = [
+    args += [
+      "--quiet",
       "--packages=$dot_packages",
       build_sdk_summaries,
       "build-$type",