cras: Add tracing for webrtc processing

BUG=b:441191070
TEST=record with ui.perfetto.dev with audio tracing enabled

Change-Id: I7b72b8acbc9651ad35fd45bbb71e582dac424011
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/7043598
Reviewed-by: Pattara Teerapong <pteerapong@chromium.org>
Commit-Queue: Li-Yu Yu <aaronyu@google.com>
Tested-by: chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com <chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com>

Author: afq984

cras/src/server/BUILD.bazel

@@ -658,6 +658,7 @@ cc_library(
         "//audio_processor/c:plugin_processor",
         "//cras/common:rust_common_cc",
         "//cras/server:cras_thread",
+        "//cras/server:cras_trace",
         "//cras/server:main_message",
         "//cras/server/platform/dlc:cc",
         "//cras/server/platform/features",

cras/src/server/cras_stream_apm.c

@@ -6,13 +6,15 @@
 #include "cras/src/server/cras_stream_apm.h"
 
 #include <inttypes.h>
+#include <percetto.h>
 #include <string.h>
 #include <syslog.h>
 
 #include "audio_processor/c/plugin_processor.h"
 #include "cras/common/check.h"
 #include "cras/common/rust_common.h"
 #include "cras/server/cras_thread.h"
+#include "cras/server/cras_trace.h"
 #include "cras/server/main_message.h"
 #include "cras/server/platform/features/features.h"
 #include "cras/server/processor/processor.h"
@@ -212,6 +214,8 @@ static struct cras_apm* get_apm_wrapper_processor(struct plugin_processor* p) {
 static enum status apm_wrapper_processor_run(struct plugin_processor* p,
                                              const struct multi_slice* input,
                                              struct multi_slice* output) {
+  TRACE_EVENT(audio, __func__);
+
   struct cras_apm* apm = get_apm_wrapper_processor(p);
   webrtc_apm_process_stream_f(apm->apm_ptr, input->channels,
                               apm->fmt.frame_rate, input->data);

cras/src/tests/BUILD.bazel

@@ -1910,6 +1910,7 @@ cc_test(
         "//audio_processor/c:plugin_processor",
         "//cras/server:cras_thread",
         "//cras/server:cras_thread_testonly",
+        "//cras/server:cras_trace",
         "//cras/server:main_message",
         "//cras/server/platform/dlc:cc",
         "//cras/server/platform/features",