SkDocument base for pdf, xps, etc.

R=scroggo@google.com

Review URL: https://codereview.chromium.org/16660002

git-svn-id: http://skia.googlecode.com/svn/trunk@9476 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 534c888..a88f722 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -186,6 +186,8 @@
         '<(skia_src_path)/core/SkWriter32.cpp',
         '<(skia_src_path)/core/SkXfermode.cpp',
 
+        '<(skia_src_path)/doc/SkDocument.cpp',
+
         '<(skia_src_path)/image/SkDataPixelRef.cpp',
         '<(skia_src_path)/image/SkImage.cpp',
         '<(skia_src_path)/image/SkImagePriv.cpp',