Add a win_force_console=1 GYP flag that makes chrome.exe and nacl64.exe console applications

chrome/chrome_dll.gypi

 # Copyright (c) 2012 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.
 {
   'conditions': [
     ['OS=="mac" or OS=="win"', {
       'targets': [
         {
           'target_name': 'chrome_dll',
           'type': 'none',
@@ skipping 128 matching lines @@
                   'msvs_settings': {
                     'VCLinkerTool': {
                       'LinkIncremental': '<(msvs_large_module_debug_link_mode)',
                     },
                   },
                 },
               },
               'msvs_settings': {
                 'VCLinkerTool': {
                   'ImportLibrary': '$(OutDir)\\lib\\chrome_dll.lib',
-                  # Set /SUBSYSTEM:WINDOWS for chrome.dll (for consistency).
-                  'SubSystem': '2',
                   'conditions': [
+                    ['win_force_console==0', {
+                      # Set /SUBSYSTEM:WINDOWS for chrome.dll (for consistency).
+                      'SubSystem': '2',
+                    }],
                     ['incremental_chrome_dll==1', {
                       'OutputFile': '$(OutDir)\\initial\\chrome.dll',
                       'UseLibraryDependencyInputs': "true",
                     }],
                     ['target_arch=="ia32"', {
                       # Don't set an x64 base address (to avoid breaking HE-ASLR).
                       'BaseAddress': '0x01c30000',
                       # Link against the XP-constrained user32 import library
                       # instead of the platform-SDK provided one to avoid
                       # inadvertently taking dependencies on post-XP user32
@@ skipping 211 matching lines @@
                   },
                 }],
               ]
             }],
           ],
         },  # target chrome_child_dll
       ],
     }],
   ],
 }