Add support for building targets directly from gyp.

pylib/gyp/generator/make.py

Index: pylib/gyp/generator/make.py
diff --git a/pylib/gyp/generator/make.py b/pylib/gyp/generator/make.py
index a4b1b1bcd37ab069ea94dbe0d5a5d3f935e0ee80..fe955c837747ce3bb3906489e87fde57cc0d52ae 100644
--- a/pylib/gyp/generator/make.py
+++ b/pylib/gyp/generator/make.py
@@ -24,6 +24,7 @@
 import os
 import re
 import sys
+import subprocess
 import gyp
 import gyp.common
 import gyp.system_test
@@ -1936,6 +1937,17 @@ def RunSystemTests(flavor):
            'ARFLAGS.host': arflags_host }
 
 
+def PerformBuild(data, configurations, params):
+  options = params['options']
+  for config in configurations:
+    arguments = ['make']
+    if options.toplevel_dir and options.toplevel_dir != '.':
+      arguments += '-C', options.toplevel_dir
+    arguments.append('BUILDTYPE=' + config)
+    print 'Building [%s]: %s' % (config, arguments)
+    subprocess.check_call(arguments)
+
+
 def GenerateOutput(target_list, target_dicts, data, params):
   options = params['options']
   flavor = gyp.common.GetFlavor(params)