Get clang updates to work with VS 2017

tools/clang/scripts/update.py

Index: tools/clang/scripts/update.py
diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index af2b34afc4d93cbc66537108d31f10af2292f762..b838752af39d7177c509b8565e6fd4b97216ca08 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -364,6 +364,16 @@ def GetVSVersion():
   # or a system-wide installation otherwise.
   sys.path.append(os.path.join(CHROMIUM_DIR, 'tools', 'gyp', 'pylib'))
   import gyp.MSVSVersion
+  #if 'GYP_MSVS_OVERRIDE_PATH' in os.environ:
+  #  return gyp.MSVSVersion.VisualStudioVersion('2017',
+  #                             'Visual Studio 2017',
+  #                             solution_version='12.00',
+  #                             project_version='15.0',
+  #                             flat_sln=False,
+  #                             uses_vcxproj=True,
+  #                             path=os.environ['GYP_MSVS_OVERRIDE_PATH'],
+  #                             sdk_based=False,
+  #                             default_toolset='v141')
   vs_version = gyp.MSVSVersion.SelectVisualStudioVersion(
       vs_toolchain.GetVisualStudioVersion())
   return vs_version