The Chrome Remote Desktop installation for Windows can be build by bots now.

remoting/remoting.gyp

 # 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.
 
 {
   'variables': {
     # TODO(dmaclach): can we pick this up some other way? Right now it's
     # duplicated from chrome.gyp
     'chromium_code': 1,
     # Use consistent strings across all platforms. Note that the plugin name
     # is brand-dependent and is defined further down.
     # Must match host/plugin/constants.h
     'host_plugin_mime_type': 'application/vnd.chromium.remoting-host',
     'host_plugin_description': 'Allow another user to access your computer securely over the Internet.',
 
     # Borrow the scripts for generating version information for remoting
     # binaries from Chrome.
     'variables': {
       'version_py_path': '../chrome/tools/build/version.py',
       'version_path': '../remoting/VERSION',
     },
     'version_py_path': '<(version_py_path)',
     'version_path': '<(version_path)',
     'version_full':
         '<!(python <(version_py_path) -f <(version_path) -t "@MAJOR@.@MINOR@.@BUILD@.@PATCH@")',
 
-    # Windows Installer XML (WiX) path can be set in ~/.gyp/include.gypi to
-    # indicate that WiX is available.
-    'wix_path%': '',
+    'platformsdk_exists': '<!(python <(DEPTH)/build/dir_exists.py ../third_party/platformsdk_win7)',
+    'wix_exists': '<!(python <(DEPTH)/build/dir_exists.py ../third_party/wix)',
 
     'conditions': [
       ['OS=="mac"', {
         'conditions': [
           ['branding=="Chrome"', {
             'mac_bundle_id': 'com.google.Chrome',
             'mac_creator': 'rimZ',
           }, {  # else: branding!="Chrome"
             'mac_bundle_id': 'org.chromium.Chromium',
             'mac_creator': 'Cr24',
@@ skipping 349 matching lines @@
                 '<(template_input_path)',
                 '<@(_outputs)',
               ],
               'message': 'Generating version information in <@(_outputs)'
             },
           ],
         },  # end of target 'remoting_version_resources'
       ],  # end of 'targets'
     }],  # 'OS=="win"'
 
-    # The host installation is generated only if WiX location is known and only
-    # as part of a non-component build. WiX does not provide a easy way to
-    # include all DLLs imported by the installed binaries depend on, so
-    # supporting the component build becomes a burden.
-    ['"<(wix_path)" != "" and component != "shared_library"', {
+    # The host installation is generated only if WiX is available and when
+    # building a non-component build. WiX does not provide a easy way to
+    # include all DLLs imported by the installed binaries, so supporting
+    # the component build becomes a burden.
+    ['OS == "win" and component != "shared_library" and wix_exists == "True" and platformsdk_exists == "True"', {
       'targets': [
         {
           'target_name': 'remoting_host_installation',
           'type': 'none',
           'dependencies': [
             'remoting_host_controller',
             'remoting_service',
             'remoting_me2me_host',
           ],
           'sources': [
             'host/installer/chromoting.wxs',
           ],
           'outputs': [
             '<(PRODUCT_DIR)/chromoting.msi',
           ],
           'variables': {
-            'sas_dll_path': '<(DEPTH)/third_party/platformsdk_win7/files/redist/x86/sas.dll'
+            'sas_dll_path': '<(DEPTH)/third_party/platformsdk_win7/files/redist/x86/sas.dll',
+            'wix_path': '<(DEPTH)\\third_party\\wix',
           },
           'conditions': [
             ['branding == "Chrome"', {
               'variables': {
                  'branding': '-dOfficialBuild=1',
               },
             }, { # else branding!="Chrome"
               'variables': {
                  'branding': '',
               },
             }],
           ],
           'rules': [
             {
               'rule_name': 'candle',
               'extension': 'wxs',
               'inputs': [
                 '<(PRODUCT_DIR)/remoting_host_controller.exe',
                 '<(PRODUCT_DIR)/remoting_me2me_host.exe',
                 '<(PRODUCT_DIR)/remoting_service.exe',
                 '<(sas_dll_path)'
               ],
               'outputs': [
                 '<(INTERMEDIATE_DIR)/<(RULE_INPUT_ROOT).wixobj',
               ],
               'process_outputs_as_sources': 1,
               'msvs_cygwin_shell': 0,
               'msvs_quote_cmd': 0,
               'action': [
-                '"<(wix_path)\\bin\\candle"',
-                '-ext "<(wix_path)\\bin\\WixFirewallExtension.dll"',
-                '-ext "<(wix_path)\\bin\\WixUIExtension.dll"',
-                '-ext "<(wix_path)\\bin\\WixUtilExtension.dll"',
+                '"<(wix_path)\\candle"',
+                '-ext "<(wix_path)\\WixFirewallExtension.dll"',
+                '-ext "<(wix_path)\\WixUIExtension.dll"',
+                '-ext "<(wix_path)\\WixUtilExtension.dll"',
                 '-dVersion=<(version_full) '
                 '"-dFileSource=<(PRODUCT_DIR)." '
                 '"-dSasDllPath=<(sas_dll_path)" '
                 '<(branding) '
                 '-out <@(_outputs)',
                 '"<(RULE_INPUT_PATH)"',
               ],
               'message': 'Generating <@(_outputs)',
             },
             {
               'rule_name': 'light',
               'extension': 'wixobj',
               'inputs': [
                 '<(PRODUCT_DIR)/remoting_host_controller.exe',
                 '<(PRODUCT_DIR)/remoting_me2me_host.exe',
                 '<(PRODUCT_DIR)/remoting_service.exe',
                 '<(sas_dll_path)'
               ],
               'outputs': [
                 '<(PRODUCT_DIR)/<(RULE_INPUT_ROOT).msi',
                 '<(PRODUCT_DIR)/<(RULE_INPUT_ROOT).wixpdb',
               ],
               'msvs_cygwin_shell': 0,
               'msvs_quote_cmd': 0,
               'action': [
-                '"<(wix_path)\\bin\\light"',
-                '-ext "<(wix_path)\\bin\\WixFirewallExtension.dll"',
-                '-ext "<(wix_path)\\bin\\WixUIExtension.dll"',
-                '-ext "<(wix_path)\\bin\\WixUtilExtension.dll"',
+                '"<(wix_path)\\light"',
+                '-ext "<(wix_path)\\WixFirewallExtension.dll"',
+                '-ext "<(wix_path)\\WixUIExtension.dll"',
+                '-ext "<(wix_path)\\WixUtilExtension.dll"',
                 '-cultures:en-us',
                 '-dVersion=<(version_full) '
                 '"-dFileSource=<(PRODUCT_DIR)." '
                 '"-dSasDllPath=<(sas_dll_path)" '
                 '<(branding) '
                 '-out "<(PRODUCT_DIR)/<(RULE_INPUT_ROOT).msi"',
                 '"<(RULE_INPUT_PATH)"',
               ],
               'message': 'Generating <(PRODUCT_DIR)/<(RULE_INPUT_ROOT).msi',
             },
@@ skipping 886 matching lines @@
                   '../base/allocator/allocator.gyp:allocator',
                 ],
               },
             ],
           ],
         }],
       ],  # end of 'conditions'
     },  # end of target 'remoting_unittests'
   ],  # end of targets
 }