Add uses clauses to filegroups to ease dependency management
diff --git a/package.json b/package.json
index 0a2ec59..d430dfe 100644
--- a/package.json
+++ b/package.json
@@ -86,21 +86,45 @@
     "src/node/src/grpc_extension.js",
     "src/node/src/metadata.js",
     "src/node/src/server.js",
-    "include/grpc/grpc_security.h",
     "include/grpc/byte_buffer.h",
     "include/grpc/byte_buffer_reader.h",
+    "include/grpc/census.h",
     "include/grpc/compression.h",
     "include/grpc/grpc.h",
-    "include/grpc/status.h",
+    "include/grpc/grpc_security.h",
     "include/grpc/impl/codegen/byte_buffer.h",
     "include/grpc/impl/codegen/compression_types.h",
     "include/grpc/impl/codegen/connectivity_state.h",
     "include/grpc/impl/codegen/grpc_types.h",
     "include/grpc/impl/codegen/propagation_bits.h",
     "include/grpc/impl/codegen/status.h",
-    "include/grpc/census.h",
+    "include/grpc/status.h",
+    "src/core/ext/transport/chttp2/transport/alpn.h",
+    "src/core/ext/transport/chttp2/transport/bin_encoder.h",
+    "src/core/ext/transport/chttp2/transport/chttp2_transport.h",
+    "src/core/ext/transport/chttp2/transport/frame.h",
+    "src/core/ext/transport/chttp2/transport/frame_data.h",
+    "src/core/ext/transport/chttp2/transport/frame_goaway.h",
+    "src/core/ext/transport/chttp2/transport/frame_ping.h",
+    "src/core/ext/transport/chttp2/transport/frame_rst_stream.h",
+    "src/core/ext/transport/chttp2/transport/frame_settings.h",
+    "src/core/ext/transport/chttp2/transport/frame_window_update.h",
+    "src/core/ext/transport/chttp2/transport/hpack_encoder.h",
+    "src/core/ext/transport/chttp2/transport/hpack_parser.h",
+    "src/core/ext/transport/chttp2/transport/hpack_table.h",
+    "src/core/ext/transport/chttp2/transport/http2_errors.h",
+    "src/core/ext/transport/chttp2/transport/huffsyms.h",
+    "src/core/ext/transport/chttp2/transport/incoming_metadata.h",
+    "src/core/ext/transport/chttp2/transport/internal.h",
+    "src/core/ext/transport/chttp2/transport/status_conversion.h",
+    "src/core/ext/transport/chttp2/transport/stream_map.h",
+    "src/core/ext/transport/chttp2/transport/timeout_encoding.h",
+    "src/core/ext/transport/chttp2/transport/varint.h",
+    "src/core/lib/census/aggregation.h",
     "src/core/lib/census/grpc_filter.h",
     "src/core/lib/census/grpc_plugin.h",
+    "src/core/lib/census/mlog.h",
+    "src/core/lib/census/rpc_metric_id.h",
     "src/core/lib/channel/channel_args.h",
     "src/core/lib/channel/channel_stack.h",
     "src/core/lib/channel/channel_stack_builder.h",
@@ -177,6 +201,15 @@
     "src/core/lib/json/json_reader.h",
     "src/core/lib/json/json_writer.h",
     "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h",
+    "src/core/lib/security/auth_filters.h",
+    "src/core/lib/security/b64.h",
+    "src/core/lib/security/credentials.h",
+    "src/core/lib/security/handshake.h",
+    "src/core/lib/security/json_token.h",
+    "src/core/lib/security/jwt_verifier.h",
+    "src/core/lib/security/secure_endpoint.h",
+    "src/core/lib/security/security_connector.h",
+    "src/core/lib/security/security_context.h",
     "src/core/lib/statistics/census_interface.h",
     "src/core/lib/statistics/census_rpc_stats.h",
     "src/core/lib/surface/api_trace.h",
@@ -198,51 +231,49 @@
     "src/core/lib/transport/static_metadata.h",
     "src/core/lib/transport/transport.h",
     "src/core/lib/transport/transport_impl.h",
-    "src/core/ext/transport/chttp2/transport/alpn.h",
-    "src/core/ext/transport/chttp2/transport/bin_encoder.h",
-    "src/core/ext/transport/chttp2/transport/chttp2_transport.h",
-    "src/core/ext/transport/chttp2/transport/frame.h",
-    "src/core/ext/transport/chttp2/transport/frame_data.h",
-    "src/core/ext/transport/chttp2/transport/frame_goaway.h",
-    "src/core/ext/transport/chttp2/transport/frame_ping.h",
-    "src/core/ext/transport/chttp2/transport/frame_rst_stream.h",
-    "src/core/ext/transport/chttp2/transport/frame_settings.h",
-    "src/core/ext/transport/chttp2/transport/frame_window_update.h",
-    "src/core/ext/transport/chttp2/transport/hpack_encoder.h",
-    "src/core/ext/transport/chttp2/transport/hpack_parser.h",
-    "src/core/ext/transport/chttp2/transport/hpack_table.h",
-    "src/core/ext/transport/chttp2/transport/http2_errors.h",
-    "src/core/ext/transport/chttp2/transport/huffsyms.h",
-    "src/core/ext/transport/chttp2/transport/incoming_metadata.h",
-    "src/core/ext/transport/chttp2/transport/internal.h",
-    "src/core/ext/transport/chttp2/transport/status_conversion.h",
-    "src/core/ext/transport/chttp2/transport/stream_map.h",
-    "src/core/ext/transport/chttp2/transport/timeout_encoding.h",
-    "src/core/ext/transport/chttp2/transport/varint.h",
-    "src/core/lib/security/auth_filters.h",
-    "src/core/lib/security/b64.h",
-    "src/core/lib/security/credentials.h",
-    "src/core/lib/security/handshake.h",
-    "src/core/lib/security/json_token.h",
-    "src/core/lib/security/jwt_verifier.h",
-    "src/core/lib/security/secure_endpoint.h",
-    "src/core/lib/security/security_connector.h",
-    "src/core/lib/security/security_context.h",
     "src/core/lib/tsi/fake_transport_security.h",
     "src/core/lib/tsi/ssl_transport_security.h",
     "src/core/lib/tsi/ssl_types.h",
     "src/core/lib/tsi/transport_security.h",
     "src/core/lib/tsi/transport_security_interface.h",
-    "src/core/lib/census/aggregation.h",
-    "src/core/lib/census/mlog.h",
-    "src/core/lib/census/rpc_metric_id.h",
     "third_party/nanopb/pb.h",
     "third_party/nanopb/pb_common.h",
     "third_party/nanopb/pb_decode.h",
     "third_party/nanopb/pb_encode.h",
+    "src/core/ext/transport/chttp2/client/insecure/channel_create.c",
+    "src/core/ext/transport/chttp2/client/secure/secure_channel_create.c",
+    "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c",
+    "src/core/ext/transport/chttp2/server/secure/server_secure_chttp2.c",
+    "src/core/ext/transport/chttp2/transport/alpn.c",
+    "src/core/ext/transport/chttp2/transport/bin_encoder.c",
+    "src/core/ext/transport/chttp2/transport/chttp2_transport.c",
+    "src/core/ext/transport/chttp2/transport/frame_data.c",
+    "src/core/ext/transport/chttp2/transport/frame_goaway.c",
+    "src/core/ext/transport/chttp2/transport/frame_ping.c",
+    "src/core/ext/transport/chttp2/transport/frame_rst_stream.c",
+    "src/core/ext/transport/chttp2/transport/frame_settings.c",
+    "src/core/ext/transport/chttp2/transport/frame_window_update.c",
+    "src/core/ext/transport/chttp2/transport/hpack_encoder.c",
+    "src/core/ext/transport/chttp2/transport/hpack_parser.c",
+    "src/core/ext/transport/chttp2/transport/hpack_table.c",
+    "src/core/ext/transport/chttp2/transport/huffsyms.c",
+    "src/core/ext/transport/chttp2/transport/incoming_metadata.c",
+    "src/core/ext/transport/chttp2/transport/parsing.c",
+    "src/core/ext/transport/chttp2/transport/status_conversion.c",
+    "src/core/ext/transport/chttp2/transport/stream_lists.c",
+    "src/core/ext/transport/chttp2/transport/stream_map.c",
+    "src/core/ext/transport/chttp2/transport/timeout_encoding.c",
+    "src/core/ext/transport/chttp2/transport/varint.c",
+    "src/core/ext/transport/chttp2/transport/writing.c",
+    "src/core/lib/census/context.c",
     "src/core/lib/census/grpc_context.c",
     "src/core/lib/census/grpc_filter.c",
     "src/core/lib/census/grpc_plugin.c",
+    "src/core/lib/census/initialize.c",
+    "src/core/lib/census/mlog.c",
+    "src/core/lib/census/operation.c",
+    "src/core/lib/census/placeholders.c",
+    "src/core/lib/census/tracing.c",
     "src/core/lib/channel/channel_args.c",
     "src/core/lib/channel/channel_stack.c",
     "src/core/lib/channel/channel_stack_builder.c",
@@ -276,6 +307,7 @@
     "src/core/lib/debug/trace.c",
     "src/core/lib/http/format_request.c",
     "src/core/lib/http/httpcli.c",
+    "src/core/lib/http/httpcli_security_connector.c",
     "src/core/lib/http/parser.c",
     "src/core/lib/iomgr/closure.c",
     "src/core/lib/iomgr/endpoint.c",
@@ -324,6 +356,20 @@
     "src/core/lib/json/json_string.c",
     "src/core/lib/json/json_writer.c",
     "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c",
+    "src/core/lib/security/b64.c",
+    "src/core/lib/security/client_auth_filter.c",
+    "src/core/lib/security/credentials.c",
+    "src/core/lib/security/credentials_metadata.c",
+    "src/core/lib/security/credentials_posix.c",
+    "src/core/lib/security/credentials_win32.c",
+    "src/core/lib/security/google_default_credentials.c",
+    "src/core/lib/security/handshake.c",
+    "src/core/lib/security/json_token.c",
+    "src/core/lib/security/jwt_verifier.c",
+    "src/core/lib/security/secure_endpoint.c",
+    "src/core/lib/security/security_connector.c",
+    "src/core/lib/security/security_context.c",
+    "src/core/lib/security/server_auth_filter.c",
     "src/core/lib/surface/alarm.c",
     "src/core/lib/surface/api_trace.c",
     "src/core/lib/surface/byte_buffer.c",
@@ -339,6 +385,7 @@
     "src/core/lib/surface/completion_queue.c",
     "src/core/lib/surface/event_string.c",
     "src/core/lib/surface/init.c",
+    "src/core/lib/surface/init_secure.c",
     "src/core/lib/surface/lame_client.c",
     "src/core/lib/surface/metadata_array.c",
     "src/core/lib/surface/server.c",
@@ -351,56 +398,9 @@
     "src/core/lib/transport/static_metadata.c",
     "src/core/lib/transport/transport.c",
     "src/core/lib/transport/transport_op_string.c",
-    "src/core/ext/transport/chttp2/transport/alpn.c",
-    "src/core/ext/transport/chttp2/transport/bin_encoder.c",
-    "src/core/ext/transport/chttp2/transport/chttp2_transport.c",
-    "src/core/ext/transport/chttp2/transport/frame_data.c",
-    "src/core/ext/transport/chttp2/transport/frame_goaway.c",
-    "src/core/ext/transport/chttp2/transport/frame_ping.c",
-    "src/core/ext/transport/chttp2/transport/frame_rst_stream.c",
-    "src/core/ext/transport/chttp2/transport/frame_settings.c",
-    "src/core/ext/transport/chttp2/transport/frame_window_update.c",
-    "src/core/ext/transport/chttp2/transport/hpack_encoder.c",
-    "src/core/ext/transport/chttp2/transport/hpack_parser.c",
-    "src/core/ext/transport/chttp2/transport/hpack_table.c",
-    "src/core/ext/transport/chttp2/transport/huffsyms.c",
-    "src/core/ext/transport/chttp2/transport/incoming_metadata.c",
-    "src/core/ext/transport/chttp2/transport/parsing.c",
-    "src/core/ext/transport/chttp2/transport/status_conversion.c",
-    "src/core/ext/transport/chttp2/transport/stream_lists.c",
-    "src/core/ext/transport/chttp2/transport/stream_map.c",
-    "src/core/ext/transport/chttp2/transport/timeout_encoding.c",
-    "src/core/ext/transport/chttp2/transport/varint.c",
-    "src/core/ext/transport/chttp2/transport/writing.c",
-    "src/core/ext/transport/chttp2/server/secure/server_secure_chttp2.c",
-    "src/core/ext/transport/chttp2/client/secure/secure_channel_create.c",
-    "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c",
-    "src/core/ext/transport/chttp2/client/insecure/channel_create.c",
-    "src/core/lib/http/httpcli_security_connector.c",
-    "src/core/lib/security/b64.c",
-    "src/core/lib/security/client_auth_filter.c",
-    "src/core/lib/security/credentials.c",
-    "src/core/lib/security/credentials_metadata.c",
-    "src/core/lib/security/credentials_posix.c",
-    "src/core/lib/security/credentials_win32.c",
-    "src/core/lib/security/google_default_credentials.c",
-    "src/core/lib/security/handshake.c",
-    "src/core/lib/security/json_token.c",
-    "src/core/lib/security/jwt_verifier.c",
-    "src/core/lib/security/secure_endpoint.c",
-    "src/core/lib/security/security_connector.c",
-    "src/core/lib/security/security_context.c",
-    "src/core/lib/security/server_auth_filter.c",
-    "src/core/lib/surface/init_secure.c",
     "src/core/lib/tsi/fake_transport_security.c",
     "src/core/lib/tsi/ssl_transport_security.c",
     "src/core/lib/tsi/transport_security.c",
-    "src/core/lib/census/context.c",
-    "src/core/lib/census/initialize.c",
-    "src/core/lib/census/mlog.c",
-    "src/core/lib/census/operation.c",
-    "src/core/lib/census/placeholders.c",
-    "src/core/lib/census/tracing.c",
     "third_party/nanopb/pb_common.c",
     "third_party/nanopb/pb_decode.c",
     "third_party/nanopb/pb_encode.c",
@@ -831,6 +831,20 @@
     "third_party/boringssl/ssl/t1_enc.c",
     "third_party/boringssl/ssl/t1_lib.c",
     "third_party/boringssl/ssl/tls_record.c",
+    "include/grpc/impl/codegen/alloc.h",
+    "include/grpc/impl/codegen/atm.h",
+    "include/grpc/impl/codegen/atm_gcc_atomic.h",
+    "include/grpc/impl/codegen/atm_gcc_sync.h",
+    "include/grpc/impl/codegen/atm_win32.h",
+    "include/grpc/impl/codegen/log.h",
+    "include/grpc/impl/codegen/port_platform.h",
+    "include/grpc/impl/codegen/slice.h",
+    "include/grpc/impl/codegen/slice_buffer.h",
+    "include/grpc/impl/codegen/sync.h",
+    "include/grpc/impl/codegen/sync_generic.h",
+    "include/grpc/impl/codegen/sync_posix.h",
+    "include/grpc/impl/codegen/sync_win32.h",
+    "include/grpc/impl/codegen/time.h",
     "include/grpc/support/alloc.h",
     "include/grpc/support/atm.h",
     "include/grpc/support/atm_gcc_atomic.h",
@@ -859,20 +873,6 @@
     "include/grpc/support/tls_msvc.h",
     "include/grpc/support/tls_pthread.h",
     "include/grpc/support/useful.h",
-    "include/grpc/impl/codegen/alloc.h",
-    "include/grpc/impl/codegen/atm.h",
-    "include/grpc/impl/codegen/atm_gcc_atomic.h",
-    "include/grpc/impl/codegen/atm_gcc_sync.h",
-    "include/grpc/impl/codegen/atm_win32.h",
-    "include/grpc/impl/codegen/log.h",
-    "include/grpc/impl/codegen/port_platform.h",
-    "include/grpc/impl/codegen/slice.h",
-    "include/grpc/impl/codegen/slice_buffer.h",
-    "include/grpc/impl/codegen/sync.h",
-    "include/grpc/impl/codegen/sync_generic.h",
-    "include/grpc/impl/codegen/sync_posix.h",
-    "include/grpc/impl/codegen/sync_win32.h",
-    "include/grpc/impl/codegen/time.h",
     "src/core/lib/profiling/timers.h",
     "src/core/lib/support/backoff.h",
     "src/core/lib/support/block_annotate.h",