Adding new header in build.json.
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 790e637..57dbd78 100644
--- a/tools/doxygen/Doxyfile.c++
+++ b/tools/doxygen/Doxyfile.c++
@@ -763,6 +763,7 @@
INPUT = include/grpc++/async_generic_service.h \
include/grpc++/async_unary_call.h \
include/grpc++/auth_context.h \
+include/grpc++/auth_metadata_processor.h \
include/grpc++/byte_buffer.h \
include/grpc++/channel_arguments.h \
include/grpc++/channel_interface.h \
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index cd1279e..5b6cf59 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -763,6 +763,7 @@
INPUT = include/grpc++/async_generic_service.h \
include/grpc++/async_unary_call.h \
include/grpc++/auth_context.h \
+include/grpc++/auth_metadata_processor.h \
include/grpc++/byte_buffer.h \
include/grpc++/channel_arguments.h \
include/grpc++/channel_interface.h \