Introduce mkgrokdump to update tools/v8heapconst.py.

test/BUILD.gn

 # 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("../gni/isolate.gni")
 import("../gni/v8.gni")
 
 group("gn_all") {
   testonly = true
 
@@ skipping 30 matching lines @@
   testonly = true
 
   if (v8_test_isolation_mode != "noop") {
     deps = [
       ":cctest_run",
       ":fuzzer_run",
       ":inspector-test_run",
       ":intl_run",
       ":message_run",
       ":mjsunit_run",
+      ":mkgrokdump_run",

[Michael Achenbach, 2017/04/12 12:39:12]

See build failure: I assume :mkgrokdump_run can be removed, since the
mkgrokdump.isolate is included in default.isolate. Or add a v8_isolate_run
target for mkgrokdump in this file.

       ":preparser_run",
       ":unittests_run",
     ]
   }
 }
 
 v8_isolate_run("bot_default") {
   deps = [
     ":default_tests",
     ":webkit_run",
@@ skipping 80 matching lines @@
 }
 
 v8_isolate_run("intl") {
   deps = [
     "..:d8_run",
   ]
 
   isolate = "intl/intl.isolate"
 }
 
 v8_isolate_run("message") {

[Michael Achenbach, 2017/04/12 12:33:42]

You might need an entry v8_isolate_run for this too? Similar to this but with
deps pointing to the mkgrokdump target instead.

I'm a bit puzzled right now why I don't see this for debugger, hmmmm.

   deps = [
     "..:d8_run",
   ]
 
   isolate = "message/message.isolate"
 }
 
 v8_isolate_run("mjsunit") {
   deps = [
     "..:d8_run",
@@ skipping 26 matching lines @@
   isolate = "unittests/unittests.isolate"
 }
 
 v8_isolate_run("webkit") {
   deps = [
     "..:d8_run",
   ]
 
   isolate = "webkit/webkit.isolate"
 }