Merge "Predefine U_IN_DOXYGEN in NDK Doxyfile" am: a42cf8d65f am: 322c2d717e

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1782972

Change-Id: I6d10a48ace633600ce5cb0216b1670665ec9e5c1