gyp: Add support to build node.js with chakracore for ARM

* Support building node.js with chakracore on Windows on ARM
* Building chakracore for ARM has a dependency on Windows SDK installed
   on the machine. Update python script to populate
   `WindowsSDKDesktopARMSupport` and `WindowsTargetPlatformVersion`
    for ARM builds. This will be using in node repo to build`chakracore.gyp`.

Author: kunalspathak

gyp/pylib/gyp/generator/msvs.py

@@ -285,6 +285,22 @@ def _ConfigFullName(config_name, config_data):
   return '%s|%s' % (_ConfigBaseName(config_name, platform_name), platform_name)
 
 
+def _ConfigWindowsTargetPlatformVersion(config_data):
+  ver = config_data.get('msvs_windows_target_platform_version')
+  if not ver or re.match(r'^\d+', ver):
+    return ver
+  for key in [r'HKLM\Software\Microsoft\Microsoft SDKs\Windows\%s',
+              r'HKLM\Software\Wow6432Node\Microsoft\Microsoft SDKs\Windows\%s']:
+    sdkdir = MSVSVersion._RegistryGetValue(key % ver, 'InstallationFolder')
+    if not sdkdir:
+      continue
+    version = MSVSVersion._RegistryGetValue(key % ver, 'ProductVersion') or ''
+    # find a matching entry in sdkdir\include
+    names = sorted([x for x in os.listdir(r'%s\include' % sdkdir) \
+                    if x.startswith(version)], reverse = True)
+    return names[0]
+
+
 def _BuildCommandLineForRuleRaw(spec, cmd, cygwin_shell, has_input_path,
                                 quote_cmd, do_setup_env):
 
@@ -2664,6 +2680,22 @@ def _GetMSBuildGlobalProperties(spec, guid, gyp_file_name):
     else:
       properties[0].append(['ApplicationType', 'Windows Store'])
 
+  platform_name = None
+  msvs_windows_target_platform_version = None
+  for configuration in spec['configurations'].itervalues():
+    platform_name = platform_name or _ConfigPlatform(configuration)
+    msvs_windows_target_platform_version = \
+                    msvs_windows_target_platform_version or \
+                    _ConfigWindowsTargetPlatformVersion(configuration)
+    if platform_name and msvs_windows_target_platform_version:
+      break
+
+  if platform_name == 'ARM':
+    properties[0].append(['WindowsSDKDesktopARMSupport', 'true'])
+  if msvs_windows_target_platform_version:
+    properties[0].append(['WindowsTargetPlatformVersion', \
+                          str(msvs_windows_target_platform_version)])
+
   return properties
 
 def _GetMSBuildConfigurationDetails(spec, build_file):

lib/build.js

@@ -227,6 +227,9 @@ function build (gyp, argv, callback) {
     // Specify the build type, Release by default
     if (win) {
       var p = arch === 'x64' ? 'x64' : 'Win32'
+      var archLower = arch.toLowerCase()
+      var p = archLower === 'x64' ? 'x64' :
+              (archLower === 'arm' ? 'ARM' : 'Win32')
       argv.push('/p:Configuration=' + buildType + ';Platform=' + p)
       if (jobs) {
         var j = parseInt(jobs, 10)