Add new module for distance field generation.

This improves the speed over the previous method by 10x+, and makes using distance fields practical.

BUG=skia:2173

Committed: http://code.google.com/p/skia/source/detail?r=13729

R=bsalomon@google.com, robertphillips@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/178543007

git-svn-id: http://skia.googlecode.com/svn/trunk@13740 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/core.gypi b/gyp/core.gypi
index a1eed0a..cdb0bab 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -70,6 +70,8 @@
         '<(skia_src_path)/core/SkDeviceProfile.cpp',
         '<(skia_src_path)/lazy/SkDiscardableMemoryPool.cpp',
         '<(skia_src_path)/lazy/SkDiscardablePixelRef.cpp',
+        '<(skia_src_path)/core/SkDistanceFieldGen.cpp',
+        '<(skia_src_path)/core/SkDistanceFieldGen.h',
         '<(skia_src_path)/core/SkDither.cpp',
         '<(skia_src_path)/core/SkDraw.cpp',
         '<(skia_src_path)/core/SkDrawLooper.cpp',