Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/call/rtc_event_log.cc

Index: webrtc/call/rtc_event_log.cc
diff --git a/webrtc/call/rtc_event_log.cc b/webrtc/call/rtc_event_log.cc
index ce4d6ef39f4b4e3fb86173d055ee526f9da8933d..cbac29f84cd251c31056155f3f8e0db2c7ecc7cc 100644
--- a/webrtc/call/rtc_event_log.cc
+++ b/webrtc/call/rtc_event_log.cc
@@ -16,6 +16,7 @@
 #include "webrtc/base/checks.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/thread_annotations.h"
+#include "webrtc/base/thread_checker.h"
 #include "webrtc/call.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
@@ -66,6 +67,7 @@ class RtcEventLogImpl final : public RtcEventLog {
 class RtcEventLogImpl final : public RtcEventLog {
  public:
   RtcEventLogImpl();
+  ~RtcEventLogImpl() override;
 
   void SetBufferDuration(int64_t buffer_duration_us) override;
   void StartLogging(const std::string& file_name, int duration_ms) override;
@@ -104,6 +106,7 @@ class RtcEventLogImpl final : public RtcEventLog {
   void AddRecentEvent(const rtclog::Event& event)
       EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
+  rtc::ThreadChecker thread_checker_;
   rtc::CriticalSection crit_;
   std::unique_ptr<FileWrapper> file_ GUARDED_BY(crit_) =
       std::unique_ptr<FileWrapper>(FileWrapper::Create());
@@ -180,6 +183,11 @@ RtcEventLogImpl::RtcEventLogImpl()
       start_time_us_(0),
       duration_us_(0),
       clock_(Clock::GetRealTimeClock()) {
+  RTC_DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+RtcEventLogImpl::~RtcEventLogImpl() {
+  RTC_DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 void RtcEventLogImpl::SetBufferDuration(int64_t buffer_duration_us) {