Add freetype to skia_base_libs when building for NaCl

External users need access to libfreetype.a when they use skia_base_libs.
Review URL: https://codereview.chromium.org/12383022

git-svn-id: http://skia.googlecode.com/svn/trunk@7934 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/skia_base_libs.gyp b/gyp/skia_base_libs.gyp
index 245babb..83cc7c7 100644
--- a/gyp/skia_base_libs.gyp
+++ b/gyp/skia_base_libs.gyp
@@ -24,6 +24,11 @@
           'gpu.gyp:skgr',
         ],
       }],
+      [ 'skia_os == "nacl"', {
+        'component_libs': [
+          'freetype.gyp:freetype',
+        ],
+      }],
     ],
   },
   'targets': [