In Google3 build, use SK_SFNTLY_SUBSETTER define to enable/disable sfntly.

src/pdf/SkPDFFont.cpp

Index: src/pdf/SkPDFFont.cpp
diff --git a/src/pdf/SkPDFFont.cpp b/src/pdf/SkPDFFont.cpp
index 15b289db092baa93675b13bd08c197429b0dbb18..5c06bcc53249a5eee2f0c831877ace5bbf47043e 100644
--- a/src/pdf/SkPDFFont.cpp
+++ b/src/pdf/SkPDFFont.cpp
@@ -24,14 +24,13 @@
 #include "SkTypes.h"
 #include "SkUtils.h"
 
-#if defined (GOOGLE3)
-    #if !defined (SK_BUILD_FOR_ANDROID) && !defined (SK_BUILD_FOR_IOS)
+#if defined (SK_SFNTLY_SUBSETTER)
+    #if defined (GOOGLE3)
         // #including #defines doesn't work with this build system.
         #include "typography/font/sfntly/src/sample/chromium/font_subsetter.h"
-        #define SK_SFNTLY_SUBSETTER  // For the benefit of #ifdefs below.
+    #else
+        #include SK_SFNTLY_SUBSETTER
     #endif
-#elif defined (SK_SFNTLY_SUBSETTER)
-    #include SK_SFNTLY_SUBSETTER
 #endif
 
 // PDF's notion of symbolic vs non-symbolic is related to the character set, not