Use a variable to control the value of LinkIncremental on Debug...

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 32 matching lines @@
     # {'variables': {'library': 'shared_library'}}
     # to compile as shared by default
     'library%': 'static_library',
 
     # TODO(bradnelson): eliminate this when possible.
     # To allow local gyp files to prevent release.vsprops from being included.
     # Yes(1) means include release.vsprops.
     # Once all vsprops settings are migrated into gyp, this can go away.
     'msvs_use_common_release%': 1,
 
+    # TODO(sgk): eliminate this if possible.
+    # It would be nicer to support this via a setting in 'target_defaults'
+    # in chrome/app/locales/locales.gypi overriding the setting in the
+    # 'Debug' configuration in the 'target_defaults' dict below,
+    # but that doesn't work as we'd like.
+    'msvs_debug_link_incremental%': '2',
+
     # The architecture that we're building on.
     'target_arch%': 'ia32',
 
     # By default linux does not use views. To turn on views in Linux
     # set the variable GYP_DEFINES to "toolkit_views=1", or modify
     # ~/.gyp/include.gypi .
     'toolkit_views%': 0,
   },
   'target_defaults': {
     'conditions': [
@@ skipping 60 matching lines @@
               'CharacterSet': '1',
             },
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'Optimization': '0',
                 'PreprocessorDefinitions': ['_DEBUG'],
                 'BasicRuntimeChecks': '3',
                 'RuntimeLibrary': '1',
               },
               'VCLinkerTool': {
-                'LinkIncremental': '2',
+                'LinkIncremental': '<(msvs_debug_link_incremental)',
               },
               'VCResourceCompilerTool': {
                 'PreprocessorDefinitions': ['_DEBUG'],
               },
             },
           }],
         ],
       },
       'Release': {
         'defines': [
@@ skipping 353 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',
   },
 }