Hook in rough distance field support for fonts

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/41213003

git-svn-id: http://skia.googlecode.com/svn/trunk@12229 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/common_variables.gypi b/gyp/common_variables.gypi
index 23aaff9..425760e 100644
--- a/gyp/common_variables.gypi
+++ b/gyp/common_variables.gypi
@@ -94,6 +94,7 @@
       'skia_win_debuggers_path%': '',
       'skia_shared_lib%': 0,
       'skia_opencl%': 0,
+      'skia_distancefield_fonts%': 0,
 
       # These variables determine the default optimization level for different
       # compilers.
@@ -153,6 +154,7 @@
     'skia_profile_enabled%': '<(skia_profile_enabled)',
     'skia_shared_lib%': '<(skia_shared_lib)',
     'skia_opencl%': '<(skia_opencl)',
+    'skia_distancefield_fonts%': '<(skia_distancefield_fonts)',
     'skia_static_initializers%': '<(skia_static_initializers)',
     'ios_sdk_version%': '6.0',
     'skia_win_debuggers_path%': '<(skia_win_debuggers_path)',