Re-install census filters.

src/core/surface/channel_create.c

@@ -38,6 +38,7 @@
 
 #include <grpc/support/alloc.h>
 
+#include "src/core/channel/census_filter.h"
 #include "src/core/channel/channel_args.h"
 #include "src/core/channel/client_channel.h"
 #include "src/core/channel/compress_filter.h"
@@ -163,10 +164,9 @@ grpc_channel *grpc_insecure_channel_create(const char *target,
   subchannel_factory *f;
   grpc_mdctx *mdctx = grpc_mdctx_create();
   int n = 0;
-  /* TODO(census)
   if (grpc_channel_args_is_census_enabled(args)) {
     filters[n++] = &grpc_client_census_filter;
-    } */
+  }
   filters[n++] = &grpc_compress_filter;
   filters[n++] = &grpc_client_channel_filter;
   GPR_ASSERT(n <= MAX_FILTERS);

src/core/surface/secure_channel_create.c

@@ -38,6 +38,7 @@
 
 #include <grpc/support/alloc.h>
 
+#include "src/core/channel/census_filter.h"
 #include "src/core/channel/channel_args.h"
 #include "src/core/channel/client_channel.h"
 #include "src/core/channel/compress_filter.h"
@@ -213,10 +214,9 @@ grpc_channel *grpc_secure_channel_create(grpc_credentials *creds,
   args_copy = grpc_channel_args_copy_and_add(
       new_args_from_connector != NULL ? new_args_from_connector : args,
       &connector_arg, 1);
-  /* TODO(census)
   if (grpc_channel_args_is_census_enabled(args)) {
     filters[n++] = &grpc_client_census_filter;
-    } */
+  }
   filters[n++] = &grpc_compress_filter;
   filters[n++] = &grpc_client_channel_filter;
   GPR_ASSERT(n <= MAX_FILTERS);

src/core/surface/server.c

@@ -818,10 +818,9 @@ grpc_server *grpc_server_create_from_filters(
   server->channel_filters =
       gpr_malloc(server->channel_filter_count * sizeof(grpc_channel_filter *));
   server->channel_filters[0] = &server_surface_filter;
-  /* TODO(census): restore this once we rework census filter
   if (census_enabled) {
     server->channel_filters[1] = &grpc_server_census_filter;
-    } */
+  }
   for (i = 0; i < filter_count; i++) {
     server->channel_filters[i + 1 + census_enabled] = filters[i];
   }