Add a new GYP_DEFINE to make _HAS_ITERATOR_DEBUGGING disablable on Windows/De...

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 416 matching lines @@
       'mac_release_optimization%': '3', # Use -O3 unless overridden
       'mac_debug_optimization%': '0',   # Use -O0 unless overridden
       # See http://msdn.microsoft.com/en-us/library/aa652360(VS.71).aspx
       'win_release_Optimization%': '2', # 2 = /Os
       'win_debug_Optimization%': '0',   # 0 = /Od
       # See http://msdn.microsoft.com/en-us/library/8wtf2dfz(VS.71).aspx
       'win_debug_RuntimeChecks%': '3',    # 3 = all checks enabled, 0 = off
       # See http://msdn.microsoft.com/en-us/library/47238hez(VS.71).aspx
       'win_debug_InlineFunctionExpansion%': '',    # empty = default, 0 = off,
       'win_release_InlineFunctionExpansion%': '2', # 1 = only __inline, 2 = max
+      # VS inserts quite a lot of extra checks to algorithms like
+      # std::partial_sort in Debug build which make them O(N^2)
+      # instead of O(N*logN). This is particularly slow under memory
+      # tools like ThreadSanitizer so we want it to be disablable.
+      # See http://msdn.microsoft.com/en-us/library/aa985982(v=VS.80).aspx
+      'win_debug_disable_iterator_debugging%': '0',
 
       'release_extra_cflags%': '',
       'debug_extra_cflags%': '',
       'release_valgrind_build%': 0,
 
       'conditions': [
         ['OS=="win" and component=="shared_library"', {
           # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
           'win_release_RuntimeLibrary%': '2', # 2 = /MT (nondebug DLL)
           'win_debug_RuntimeLibrary%': '3',   # 3 = /MTd (debug DLL)
@@ skipping 268 matching lines @@
               # According to MSVS, InlineFunctionExpansion=0 means
               # "default inlining", not "/Ob0".
               # Thus, we have to handle InlineFunctionExpansion==0 separately.
               ['win_debug_InlineFunctionExpansion==0', {
                 'AdditionalOptions': ['/Ob0'],
               }],
               ['win_debug_InlineFunctionExpansion!=""', {
                 'InlineFunctionExpansion':
                   '<(win_debug_InlineFunctionExpansion)',
               }],
+              ['win_debug_disable_iterator_debugging==1', {
+                'PreprocessorDefinitions': ['_HAS_ITERATOR_DEBUGGING=0'],
+              }],
             ],
           },
           'VCLinkerTool': {
             'LinkIncremental': '<(msvs_debug_link_incremental)',
           },
           'VCResourceCompilerTool': {
             'PreprocessorDefinitions': ['_DEBUG'],
           },
         },
         'conditions': [
@@ skipping 783 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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