Update the pdfium library - framework

Change-Id: I4880e9310c02c6e26d4560fb8515f2ce51c597f4
diff --git a/core/jni/Android.mk b/core/jni/Android.mk
index 40fee2c..faf926c 100644
--- a/core/jni/Android.mk
+++ b/core/jni/Android.mk
@@ -183,6 +183,7 @@
     external/pdfium/core/include/fpdfapi \
     external/pdfium/core/include/fpdfdoc \
     external/pdfium/fpdfsdk/include \
+    external/pdfium/public \
     external/skia/src/core \
     external/skia/src/effects \
     external/skia/src/images \