Add NaCl port of Skia

Initial commit. This is far from done.
Review URL: https://codereview.appspot.com/6428064

git-svn-id: http://skia.googlecode.com/svn/trunk@5398 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/common_variables.gypi b/gyp/common_variables.gypi
index 4e4c43c..3226212 100644
--- a/gyp/common_variables.gypi
+++ b/gyp/common_variables.gypi
@@ -71,6 +71,7 @@
       'skia_arch_type%': 'x86',
       'skia_directwrite%': 0,
       'android_make_apk%': 1,
+      'skia_nacl%': 0,
       'skia_gpu%': 1,
       'skia_static_initializers%': 1,
     },
@@ -87,6 +88,7 @@
     'skia_arch_width%': '<(skia_arch_width)',
     'skia_directwrite%': '<(skia_directwrite)',
     'android_make_apk%': '<(android_make_apk)',
+    'skia_nacl%': '<(skia_nacl)',
     'skia_gpu%': '<(skia_gpu)',
     'skia_static_initializers%': '<(skia_static_initializers)',