Lower event-tracing log-thread priority.

webrtc/base/event_tracer.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include "webrtc/base/event_tracer.h"
@@ skipping 142 matching lines @@
       trace_events_.clear();
     }
     // Enable event logging (fast-path). This should be disabled since starting
     // shouldn't be done twice.
     RTC_CHECK_EQ(0,
                  rtc::AtomicOps::CompareAndSwap(&g_event_logging_active, 0, 1));
 
     // Finally start, everything should be set up now.
     logging_thread_.Start();
     TRACE_EVENT_INSTANT0("webrtc", "EventLogger::Start");
+    logging_thread_.SetPriority(kLowPriority);
   }
 
   void Stop() {
     RTC_DCHECK(thread_checker_.CalledOnValidThread());
     TRACE_EVENT_INSTANT0("webrtc", "EventLogger::Stop");
     // Try to stop. Abort if we're not currently logging.
     if (rtc::AtomicOps::CompareAndSwap(&g_event_logging_active, 1, 0) == 0)
       return;
 
     // Wake up logging thread to finish writing.
@@ skipping 92 matching lines @@
   RTC_DCHECK(old_logger);
   RTC_CHECK(rtc::AtomicOps::CompareAndSwapPtr(
                 &g_event_logger, old_logger,
                 static_cast<EventLogger*>(nullptr)) == old_logger);
   delete old_logger;
   webrtc::SetupEventTracer(nullptr, nullptr);
 }
 
 }  // namespace tracing
 }  // namespace rtc