Created placeholders for MallocHooks implementation and added define DART_USE_TCMALLOC to specifiy …

runtime/vm/vm.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
     'libgen_in_cc_file': '../lib/libgen_in.cc',
     'builtin_in_cc_file': '../bin/builtin_in.cc',
     'async_cc_file': '<(gen_source_dir)/async_gen.cc',
@@ skipping 43 matching lines @@
       'conditions': [
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
+        ['OS == "linux" and asan == 0 and msan == 0 and tsan == 0', {

[bkonyi, 2017/01/05 23:29:04]

There was already a rule for 'OS == "linux' so I added a separate condition for
the tcmalloc dependency inclusion. Let me know if this isn't right. Also, I'll
fix the indentation during my next patch.

+          'dependencies': [
+            '../third_party/tcmalloc/tcmalloc.gypi:tcmalloc',

[zra, 2017/01/06 16:13:17]

I think it's not necessary to add the dependence on tcmalloc here. Instead maybe
just add a comment that the condition should be kept in sync with where we're
already adding the dependence. Normally we'd figure out how to add a variable
somewhere to keep them from going out of sync, but since gyp is going away soon
it's probably not worth spending time out.

[bkonyi, 2017/01/06 20:23:34]

Done.

+          ],
+          'defines': [
+            'DART_USE_TCMALLOC'
+          ],
+        }],
         ['OS=="android" and _toolset=="host"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
         ['OS=="win"', {
@@ skipping 24 matching lines @@
       'conditions': [
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
+        ['OS == "linux" and asan == 0 and msan == 0 and tsan == 0', {
+          'dependencies': [

[zra, 2017/01/06 16:13:17]

ditto

[bkonyi, 2017/01/06 20:23:34]

Done.

+            '../third_party/tcmalloc/tcmalloc.gypi:tcmalloc',
+          ],
+          'defines': [
+            'DART_USE_TCMALLOC'
+          ],
+        }],
         ['OS=="android" and _toolset=="host"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
         ['OS=="win"', {
@@ skipping 24 matching lines @@
       'conditions': [
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
+        ['OS == "linux" and asan == 0 and msan == 0 and tsan == 0', {
+          'dependencies': [

[zra, 2017/01/06 16:13:17]

ditto

[bkonyi, 2017/01/06 20:23:34]

Done.

+            '../third_party/tcmalloc/tcmalloc.gypi:tcmalloc',
+          ],
+          'defines': [
+            'DART_USE_TCMALLOC'
+          ],
+        }],
         ['OS=="android" and _toolset=="host"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
         ['OS=="win"', {
@@ skipping 25 matching lines @@
       'conditions': [
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
+        ['OS == "linux" and asan == 0 and msan == 0 and tsan == 0', {
+          'dependencies': [

[zra, 2017/01/06 16:13:17]

ditto

[bkonyi, 2017/01/06 20:23:34]

Done.

+            '../third_party/tcmalloc/tcmalloc.gypi:tcmalloc',
+          ],
+          'defines': [
+            'DART_USE_TCMALLOC'
+          ],
+        }],
         ['OS=="android" and _toolset=="host"', {
           'link_settings': {
             'libraries': [
               '-lpthread',
               '-lrt',
               '-ldl',
             ],
           },
         }],
         ['OS=="win"', {
@@ skipping 1546 matching lines @@
             '--output',
             '<(gen_source_dir)/patches/<(library_name)_patch.dart',
             '<@(_sources)',
           ],
           'message': 'Generating <(library_uri) patch.',
         },
       ],
     },
   ]
 }