[gn] Add swarming support for all test targets

gni/isolate.gni

Index: gni/isolate.gni
diff --git a/gni/isolate.gni b/gni/isolate.gni
index ac1bb79e2935f0e7c2caa11d6272ab7a765778bb..9f29556ef866bb2198f9de1fc0f031a903f1b1ac 100644
--- a/gni/isolate.gni
+++ b/gni/isolate.gni
@@ -17,9 +17,11 @@ template("v8_isolate_run") {
   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,
@@ -27,13 +29,20 @@ template("v8_isolate_run") {
 
       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") {

[Michael Achenbach, 2016/06/03 13:30:18]

Drive by fix. This was always wrong on the gyp side as it seems. Lets fix it
here at least. We usually use prepare on the bots, which generates just the
gen.json file.

+        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) {