Introduce mkgrokdump to update tools/v8heapconst.py.

gypfiles/all.gyp

 # Copyright 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'dependencies': [
         '../src/d8.gyp:d8',
         '../test/inspector/inspector.gyp:*',
+        '../tools/mkgrokdump.gyp:mkgrokdump',
       ],
       'conditions': [
         ['component!="shared_library"', {
           'dependencies': [
             '../tools/parser-shell.gyp:parser-shell',
           ],
         }],
         # These items don't compile for Android on Mac.
         ['host_os!="mac" or OS!="android"', {
           'dependencies': [
@@ skipping 22 matching lines @@
             '../tools/gcmole/run_gcmole.gyp:*',
             '../tools/jsfunfuzz/jsfunfuzz.gyp:*',
             '../tools/run-deopt-fuzzer.gyp:*',
             '../tools/run-valgrind.gyp:*',
           ],
         }],
       ]
     }
   ]
 }