Improve NaCl support

- Add nacl_make script to build Skia targets for NaCl using gyp
- Add nacl_interface for command-line apps
- Add nacl_sample as front-end for SampleApp
- Add freetype to DEPS
- Various gyp tweaks for NaCl

TODO:
- Implement GL interface
- Implement font host
- Fix plumbing so that SampleApp works properly
Review URL: https://codereview.appspot.com/6671044

git-svn-id: http://skia.googlecode.com/svn/trunk@6245 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/DEPS b/DEPS
index 016213e..55a6401 100644
--- a/DEPS
+++ b/DEPS
@@ -9,6 +9,7 @@
 #
 deps = {
   "third_party/externals/angle" : "http://angleproject.googlecode.com/svn/trunk@1268",
+  "third_party/externals/freetype" : "https://android.googlesource.com/platform/external/freetype.git",
   "third_party/externals/gyp" : "http://gyp.googlecode.com/svn/trunk@1517",
   "third_party/externals/libjpeg" : "http://src.chromium.org/svn/trunk/src/third_party/libjpeg@125399",
   "third_party/externals/jsoncpp" : "http://src.chromium.org/svn/trunk/src/third_party/jsoncpp@125399",