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

webrtc/modules/audio_processing/gain_control_impl.h

Index: webrtc/modules/audio_processing/gain_control_impl.h
diff --git a/webrtc/modules/audio_processing/gain_control_impl.h b/webrtc/modules/audio_processing/gain_control_impl.h
index 1573aea3d1bfbbca7291408b4b40739e2bc06d64..898683b07bad6e56214624c1469fa85030771c79 100644
--- a/webrtc/modules/audio_processing/gain_control_impl.h
+++ b/webrtc/modules/audio_processing/gain_control_impl.h
@@ -14,6 +14,7 @@
 #include <vector>
 
 #include "webrtc/base/scoped_ptr.h"
+#include "webrtc/base/thread_checker.h"
 #include "webrtc/common_audio/swap_queue.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 #include "webrtc/modules/audio_processing/processing_component.h"
@@ -48,7 +49,9 @@ class GainControlImpl : public GainControl,
                         public ProcessingComponent {
  public:
   GainControlImpl(const AudioProcessing* apm,
-                  CriticalSectionWrapper* crit);
+                  CriticalSectionWrapper* crit,
+                  rtc::ThreadChecker* render_thread,
+                  rtc::ThreadChecker* capture_thread);
   virtual ~GainControlImpl();
 
   int ProcessRenderAudio(AudioBuffer* audio);
@@ -100,6 +103,8 @@ class GainControlImpl : public GainControl,
 
   const AudioProcessing* apm_;
   CriticalSectionWrapper* crit_;
+  const rtc::ThreadChecker* const render_thread_;
+  const rtc::ThreadChecker* const capture_thread_;
   Mode mode_;
   int minimum_capture_level_;
   int maximum_capture_level_;