Implement AImageDecoder_computeSampledSize

Bug: 135133301
Test: If9ed79d8dcf1169369ba454723f4ac8d26427b7b
Change-Id: I4926188cf66e2693c09dd7f1197173441936080c
diff --git a/native/graphics/jni/libjnigraphics.map.txt b/native/graphics/jni/libjnigraphics.map.txt
index 6843e7a..d9e7828 100644
--- a/native/graphics/jni/libjnigraphics.map.txt
+++ b/native/graphics/jni/libjnigraphics.map.txt
@@ -10,6 +10,7 @@
     AImageDecoder_getMinimumStride; # introduced=30
     AImageDecoder_decodeImage; # introduced=30
     AImageDecoder_setTargetSize; # introduced=30
+    AImageDecoder_computeSampledSize; # introduced=30
     AImageDecoder_setCrop; # introduced=30
     AImageDecoderHeaderInfo_getWidth; # introduced=30
     AImageDecoderHeaderInfo_getHeight; # introduced=30