Fix Android build broken due to changes in r4741.


git-svn-id: http://skia.googlecode.com/svn/trunk@4743 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkScalerContext.h b/include/core/SkScalerContext.h
index ac11b9c..ccc4fa9 100644
--- a/include/core/SkScalerContext.h
+++ b/include/core/SkScalerContext.h
@@ -12,6 +12,11 @@
 #include "SkMatrix.h"
 #include "SkPaint.h"
 
+#ifdef SK_BUILD_FOR_ANDROID
+  //For SkFontID
+  #include "SkTypeface.h"
+#endif
+
 //#define SK_USE_COLOR_LUMINANCE
 
 struct SkGlyph;