Add script to generate GN/MSVS projects.

scripts/msvs_projects.py

+#!/usr/bin/python
+#
+# Copyright 2017 The ANGLE Project Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# msvs_projects.py:
+#   A helper utility that generates Visual Studio projects for each of
+#   the available directories in 'out', and then runs another helper
+#   utility that merges these projects into one solution.
+
+import sys, os, subprocess
+
+# Change this to target another VS version.
+target_ide = 'vs2017'
+solution_name = 'ANGLE'
+
+script_dir = os.path.dirname(sys.argv[0])
+
+# Set the CWD to the root ANGLE folder.
+os.chdir(os.path.join(script_dir, '..'))
+
+out_dir = 'out'
+
+# Generate the VS solutions for any valid directory.
+def generate_projects(dirname):
+    args = ['gn.bat', 'gen', dirname, '--ide=' + target_ide, '--sln=' + solution_name]
+    print('Running "' + ' '.join(args) + '"')
+    subprocess.call(args)
+
+for potential_dir in os.listdir(out_dir):
+    path = os.path.join(out_dir, potential_dir)
+    build_ninja_d = os.path.join(path, 'build.ninja.d')
+    if os.path.exists(build_ninja_d):
+        generate_projects(path)
+
+# Run the helper utility that merges the projects.
+args = ['python', os.path.join('build', 'win', 'gn_meta_sln.py')]
+print('Running "' + ' '.join(args) + '"')
+subprocess.call(args)
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