[gn] Add swarming support for all test targets

gni/isolate.gni

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/sanitizers/sanitizers.gni")
 import("v8.gni")
 
 declare_args() {
   # Sets the test isolation mode (noop|prepare|check).
   v8_test_isolation_mode = "noop"
 }
 
 template("v8_isolate_run") {
   # Remember target name as within the action scope the target name will be
   # different.
   name = target_name
   if (name != "" && invoker.isolate != "" && invoker.deps != [] &&
       v8_test_isolation_mode != "noop") {
     action(name + "_run") {
+      testonly = true
+
       deps = invoker.deps
 
-      script = "tools/isolate_driver.py"
+      script = "//tools/isolate_driver.py"
 
       sources = [
         invoker.isolate,
       ]
 
       inputs = [
         # Files that are known to be involved in this step.
-        "tools/swarming_client/isolate.py",
-        "tools/swarming_client/run_isolated.py",
+        "//tools/swarming_client/isolate.py",
+        "//tools/swarming_client/run_isolated.py",
       ]
 
-      outputs = [
-        "$root_out_dir/$name.isolated",
-      ]
+      if (v8_test_isolation_mode == "prepare") {
+        outputs = [
+          "$root_out_dir/$name.isolated.gen.json",
+        ]
+      } else if (v8_test_isolation_mode == "check") {
+        outputs = [
+          "$root_out_dir/$name.isolated",
+          "$root_out_dir/$name.isolated.state",
+        ]
+      }
 
       # Translate gn to gyp variables.
       if (is_asan) {
         asan = "1"
       } else {
         asan = "0"
       }
       if (is_msan) {
         msan = "1"
       } else {
@@ skipping 103 matching lines @@
         ]
       } else {
         args += [
           "--config-variable",
           "msvs_version=0",
         ]
       }
     }
   }
 }