Merge pull request #4514 from yang-g/master

hide a debug log under trace and fix two log levels

src/core/transport/chttp2/frame_settings.c

@@ -240,8 +240,10 @@ grpc_chttp2_parse_error grpc_chttp2_settings_parser_parse(
             transport_parsing->initial_window_update =
                 (gpr_int64)parser->value -
                 parser->incoming_settings[parser->id];
-            gpr_log(GPR_DEBUG, "adding %d for initial_window change",
-                    (int)transport_parsing->initial_window_update);
+            if (grpc_http_trace) {
+              gpr_log(GPR_DEBUG, "adding %d for initial_window change",
+                      (int)transport_parsing->initial_window_update);
+            }
           }
           parser->incoming_settings[parser->id] = parser->value;
           if (grpc_http_trace) {

src/core/transport/chttp2_transport.c

@@ -348,7 +348,7 @@ static void init_transport(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
           gpr_log(GPR_ERROR, "%s: must be an integer",
                   GRPC_ARG_HTTP2_HPACK_TABLE_SIZE_DECODER);
         } else if (channel_args->args[i].value.integer < 0) {
-          gpr_log(GPR_DEBUG, "%s: must be non-negative",
+          gpr_log(GPR_ERROR, "%s: must be non-negative",
                   GRPC_ARG_HTTP2_HPACK_TABLE_SIZE_DECODER);
         } else {
           push_setting(t, GRPC_CHTTP2_SETTINGS_HEADER_TABLE_SIZE,
@@ -360,7 +360,7 @@ static void init_transport(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
           gpr_log(GPR_ERROR, "%s: must be an integer",
                   GRPC_ARG_HTTP2_HPACK_TABLE_SIZE_ENCODER);
         } else if (channel_args->args[i].value.integer < 0) {
-          gpr_log(GPR_DEBUG, "%s: must be non-negative",
+          gpr_log(GPR_ERROR, "%s: must be non-negative",
                   GRPC_ARG_HTTP2_HPACK_TABLE_SIZE_ENCODER);
         } else {
           grpc_chttp2_hpack_compressor_set_max_usable_size(