Renamed "none" as "identity" for the no-op compression algorithm for consistency with the spec

src/core/compression/algorithm.c

@@ -37,7 +37,7 @@
 
 int grpc_compression_algorithm_parse(const char* name,
                                      grpc_compression_algorithm *algorithm) {
-  if (strcmp(name, "none") == 0) {
+  if (strcmp(name, "identity") == 0) {
     *algorithm = GRPC_COMPRESS_NONE;
   } else if (strcmp(name, "gzip") == 0) {
     *algorithm = GRPC_COMPRESS_GZIP;
@@ -53,7 +53,7 @@ int grpc_compression_algorithm_name(grpc_compression_algorithm algorithm,
                                     char **name) {
   switch (algorithm) {
     case GRPC_COMPRESS_NONE:
-      *name = "none";
+      *name = "identity";
       break;
     case GRPC_COMPRESS_DEFLATE:
       *name = "deflate";

test/core/end2end/tests/request_with_compressed_payload.c

@@ -300,12 +300,12 @@ static void test_invoke_request_with_compressed_payload_md_override(
          sizeof(gzip_compression_override.internal_data));
 
   none_compression_override.key = GRPC_COMPRESS_REQUEST_ALGORITHM_KEY;
-  none_compression_override.value = "none";
+  none_compression_override.value = "identity";
   none_compression_override.value_length = 4;
   memset(&none_compression_override.internal_data, 0,
          sizeof(none_compression_override.internal_data));
 
-  /* Channel default NONE, call override to GZIP */
+  /* Channel default NONE (aka IDENTITY), call override to GZIP */
   request_with_payload_template(
       config, "test_invoke_request_with_compressed_payload_md_override_1", 0,
       GRPC_COMPRESS_NONE, GRPC_COMPRESS_GZIP, &gzip_compression_override);
@@ -315,7 +315,7 @@ static void test_invoke_request_with_compressed_payload_md_override(
       config, "test_invoke_request_with_compressed_payload_md_override_2", 0,
       GRPC_COMPRESS_DEFLATE, GRPC_COMPRESS_GZIP, &gzip_compression_override);
 
-  /* Channel default DEFLATE, call override to NONE */
+  /* Channel default DEFLATE, call override to NONE (aka IDENTITY) */
   request_with_payload_template(
       config, "test_invoke_request_with_compressed_payload_md_override_3", 0,
       GRPC_COMPRESS_DEFLATE, GRPC_COMPRESS_NONE, &none_compression_override);