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

webrtc/modules/audio_processing/echo_control_mobile_impl.cc

Index: webrtc/modules/audio_processing/echo_control_mobile_impl.cc
diff --git a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
index 420039c9ec8732a31edefa5c46308fc50716f2d1..b2cd5c6cd2c7404348275ea92655a2ceaf5a079b 100644
--- a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
+++ b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
@@ -66,10 +66,14 @@ size_t EchoControlMobile::echo_path_size_bytes() {
 }
 
 EchoControlMobileImpl::EchoControlMobileImpl(const AudioProcessing* apm,
-                                             CriticalSectionWrapper* crit)
+                                             CriticalSectionWrapper* crit,
+                                             rtc::ThreadChecker* render_thread,
+                                             rtc::ThreadChecker* capture_thread)
     : ProcessingComponent(),
       apm_(apm),
       crit_(crit),
+      render_thread_(render_thread),
+      capture_thread_(capture_thread),
       routing_mode_(kSpeakerphone),
       comfort_noise_enabled_(true),
       external_echo_path_(NULL),
@@ -85,6 +89,7 @@ EchoControlMobileImpl::~EchoControlMobileImpl() {
 }
 
 int EchoControlMobileImpl::ProcessRenderAudio(const AudioBuffer* audio) {
+  RTC_DCHECK(render_thread_->CalledOnValidThread());
   if (!is_component_enabled()) {
     return apm_->kNoError;
   }
@@ -131,6 +136,7 @@ int EchoControlMobileImpl::ProcessRenderAudio(const AudioBuffer* audio) {
 // Read chunks of data that were received and queued on the render side from
 // a queue. All the data chunks are buffered into the farend signal of the AEC.
 void EchoControlMobileImpl::ReadQueuedRenderData() {
+  RTC_DCHECK(capture_thread_->CalledOnValidThread());
   if (!is_component_enabled()) {
     return;
   }
@@ -157,6 +163,7 @@ void EchoControlMobileImpl::ReadQueuedRenderData() {
 }
 
 int EchoControlMobileImpl::ProcessCaptureAudio(AudioBuffer* audio) {
+  RTC_DCHECK(capture_thread_->CalledOnValidThread());
   if (!is_component_enabled()) {
     return apm_->kNoError;
   }