Added NVALGRIND define [on by default]. Can be turned off on valgrind slaves ...

src/build/common.gypi

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
     # code, as opposed to external code.  This variable is used to control
     # such things as the set of warnings to enable, and whether warnings are
     # treated as errors.
@@ skipping 155 matching lines @@
         ],
       }],
     ],
   },
   'target_defaults': {
     'variables': {
       'mac_release_optimization%': '3', # Use -O3 unless overridden
       'mac_debug_optimization%': '0',   # Use -O0 unless overridden
       'release_extra_cflags%': '',
       'debug_extra_cflags%': '',
+      'release_valgrind_build%': 0,
     },
     'conditions': [
       ['branding=="Chrome"', {
         'defines': ['GOOGLE_CHROME_BUILD'],
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
       }],
       ['experimental_build_define', {
         'defines': ['CHROME_EXP_BUILD'],
       }],
@@ skipping 88 matching lines @@
       'Release': {
         'defines': [
           'NDEBUG',
         ],
         'xcode_settings': {
           'DEAD_CODE_STRIPPING': 'YES',  # -Wl,-dead_strip
           'GCC_OPTIMIZATION_LEVEL': '<(mac_release_optimization)',
           'OTHER_CFLAGS': [ '<@(release_extra_cflags)', ],
         },
         'conditions': [
+          ['release_valgrind_build==0', {
+            'defines': ['NVALGRIND'],
+          }],
           [ 'OS=="win" and msvs_use_common_release', {
             'msvs_props': ['release.vsprops'],
           }],
           [ 'OS=="win"', {
             'configuration_platform': 'Win32',
             'msvs_configuration_attributes': {
               'OutputDirectory': '$(SolutionDir)$(ConfigurationName)',
               'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
               'CharacterSet': '1',
             },
@@ skipping 495 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }