Parse XMP offset/size for HEIF

bug: 159373092
test: local manual test that ExifInterface gets the XMP offset/size
correctly

Change-Id: Ie3dda2a716a1e6d104367182461329cb4b23fa44
diff --git a/media/ndk/NdkMediaFormat.cpp b/media/ndk/NdkMediaFormat.cpp
index 47214c5..8e673ca 100644
--- a/media/ndk/NdkMediaFormat.cpp
+++ b/media/ndk/NdkMediaFormat.cpp
@@ -384,6 +384,8 @@
 EXPORT const char* AMEDIAFORMAT_KEY_TRACK_INDEX = "track-index";
 EXPORT const char* AMEDIAFORMAT_KEY_VALID_SAMPLES = "valid-samples";
 EXPORT const char* AMEDIAFORMAT_KEY_WIDTH = "width";
+EXPORT const char* AMEDIAFORMAT_KEY_XMP_OFFSET = "xmp-offset";
+EXPORT const char* AMEDIAFORMAT_KEY_XMP_SIZE = "xmp-size";
 EXPORT const char* AMEDIAFORMAT_KEY_YEAR = "year";
 
 } // extern "C"