Add missing SK_API definition at request of Chromium callers

Review URL: https://codereview.appspot.com/6878050

git-svn-id: http://skia.googlecode.com/svn/trunk@6671 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/utils.gyp b/gyp/utils.gyp
index 7bbe67c..5658f04 100644
--- a/gyp/utils.gyp
+++ b/gyp/utils.gyp
@@ -43,6 +43,7 @@
         '../include/utils/SkParse.h',
         '../include/utils/SkParsePaint.h',
         '../include/utils/SkParsePath.h',
+        '../include/utils/SkPictureUtils.h',
         '../include/utils/SkProxyCanvas.h',
         '../include/utils/SkUnitMappers.h',
         '../include/utils/SkWGL.h',