Preparational work for an upcoming addition of a threadchecking scheme for APM

webrtc/modules/audio_processing/gain_control_impl.cc

Index: webrtc/modules/audio_processing/gain_control_impl.cc
diff --git a/webrtc/modules/audio_processing/gain_control_impl.cc b/webrtc/modules/audio_processing/gain_control_impl.cc
index db7b8d9b1c48a31581d502cef7704dec447466d5..e0883ebfcaf9728a361cd8e6197c551d8acb2294 100644
--- a/webrtc/modules/audio_processing/gain_control_impl.cc
+++ b/webrtc/modules/audio_processing/gain_control_impl.cc
@@ -39,10 +39,14 @@ const size_t GainControlImpl::kAllowedValuesOfSamplesPerFrame1;
 const size_t GainControlImpl::kAllowedValuesOfSamplesPerFrame2;
 
 GainControlImpl::GainControlImpl(const AudioProcessing* apm,
-                                 CriticalSectionWrapper* crit)
+                                 CriticalSectionWrapper* crit,
+                                 rtc::ThreadChecker* render_thread_checker,
+                                 rtc::ThreadChecker* capture_thread_checker)
     : ProcessingComponent(),
       apm_(apm),
       crit_(crit),
+      render_thread_checker_(render_thread_checker),
+      capture_thread_checker_(capture_thread_checker),
       mode_(kAdaptiveAnalog),
       minimum_capture_level_(0),
       maximum_capture_level_(255),
@@ -59,6 +63,7 @@ GainControlImpl::GainControlImpl(const AudioProcessing* apm,
 GainControlImpl::~GainControlImpl() {}
 
 int GainControlImpl::ProcessRenderAudio(AudioBuffer* audio) {
+  RTC_DCHECK(render_thread_checker_->CalledOnValidThread());
   if (!is_component_enabled()) {
     return apm_->kNoError;
   }
@@ -213,6 +218,7 @@ int GainControlImpl::ProcessCaptureAudio(AudioBuffer* audio) {
 
 // TODO(ajm): ensure this is called under kAdaptiveAnalog.
 int GainControlImpl::set_stream_analog_level(int level) {
+  RTC_DCHECK(capture_thread_checker_->CalledOnValidThread());
   // TODO(peah): Verify that this is really needed to do the reading.
   // here as well as in ProcessStream. It works since these functions
   // are called from the same thread, but it is not nice to do it in two
@@ -230,6 +236,7 @@ int GainControlImpl::set_stream_analog_level(int level) {
 }
 
 int GainControlImpl::stream_analog_level() {
+  RTC_DCHECK(capture_thread_checker_->CalledOnValidThread());
   // TODO(ajm): enable this assertion?
   //assert(mode_ == kAdaptiveAnalog);