Add support for MIDL include directories

pylib/gyp/generator/msvs.py

Index: pylib/gyp/generator/msvs.py
diff --git a/pylib/gyp/generator/msvs.py b/pylib/gyp/generator/msvs.py
index 517ce3c623ae0e9b695cdff0e717b0279627acd8..f529d39a98d37c76b5eda390199f454cdd465dd1 100644
--- a/pylib/gyp/generator/msvs.py
+++ b/pylib/gyp/generator/msvs.py
@@ -1109,7 +1109,8 @@ def _AddConfigurationToMSVSProject(p, spec, config_type, config_name, config):
             for this configuration.
   """
   # Get the information for this configuration
-  include_dirs, resource_include_dirs = _GetIncludeDirs(config)
+  include_dirs, midl_include_dirs, resource_include_dirs = \
+      _GetIncludeDirs(config)
   libraries = _GetLibraries(spec)
   library_dirs = _GetLibraryDirs(config)
   out_file, vc_tool, _ = _GetOutputFilePathAndTool(spec, msbuild=False)
@@ -1137,6 +1138,8 @@ def _AddConfigurationToMSVSProject(p, spec, config_type, config_name, config):
   # Add the information to the appropriate tool
   _ToolAppend(tools, 'VCCLCompilerTool',
               'AdditionalIncludeDirectories', include_dirs)
+  _ToolAppend(tools, 'VCMIDLTool',
+              'AdditionalIncludeDirectories', midl_include_dirs)
   _ToolAppend(tools, 'VCResourceCompilerTool',
               'AdditionalIncludeDirectories', resource_include_dirs)
   # Add in libraries.
@@ -1192,10 +1195,14 @@ def _GetIncludeDirs(config):
   include_dirs = (
       config.get('include_dirs', []) +
       config.get('msvs_system_include_dirs', []))
+  midl_include_dirs = (
+      config.get('midl_include_dirs', []) +
+      config.get('msvs_system_include_dirs', []))
   resource_include_dirs = config.get('resource_include_dirs', include_dirs)
   include_dirs = _FixPaths(include_dirs)
+  midl_include_dirs = _FixPaths(midl_include_dirs)
   resource_include_dirs = _FixPaths(resource_include_dirs)
-  return include_dirs, resource_include_dirs
+  return include_dirs, midl_include_dirs, resource_include_dirs
 
 
 def _GetLibraryDirs(config):
@@ -2929,7 +2936,8 @@ def _FinalizeMSBuildSettings(spec, configuration):
     converted = True
     msvs_settings = configuration.get('msvs_settings', {})
     msbuild_settings = MSVSSettings.ConvertToMSBuildSettings(msvs_settings)
-  include_dirs, resource_include_dirs = _GetIncludeDirs(configuration)
+  include_dirs, midl_include_dirs, resource_include_dirs = \
+      _GetIncludeDirs(configuration)
   libraries = _GetLibraries(spec)
   library_dirs = _GetLibraryDirs(configuration)
   out_file, _, msbuild_tool = _GetOutputFilePathAndTool(spec, msbuild=True)
@@ -2959,6 +2967,8 @@ def _FinalizeMSBuildSettings(spec, configuration):
   # if you don't have any resources.
   _ToolAppend(msbuild_settings, 'ClCompile',
               'AdditionalIncludeDirectories', include_dirs)
+  _ToolAppend(msbuild_settings, 'Midl',
+              'AdditionalIncludeDirectories', midl_include_dirs)
   _ToolAppend(msbuild_settings, 'ResourceCompile',
               'AdditionalIncludeDirectories', resource_include_dirs)
   # Add in libraries, note that even for empty libraries, we want this