Suppress TSan deadlock report in TraceControllerImpl.

build/sanitizers/tsan_suppressions.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains the default suppressions for ThreadSanitizer.
 // You can also pass additional suppressions via TSAN_OPTIONS:
 // TSAN_OPTIONS=suppressions=/path/to/suppressions. Please refer to
 // http://dev.chromium.org/developers/testing/threadsanitizer-tsan-v2
 // for more info.
 
@@ skipping 267 matching lines @@
 "race:webrtc::RemoteNtpTimeEstimator::Estimate\n"
 "race:webrtc::voe::TransmitMixer::EnableStereoChannelSwapping\n"
 
 // http://crbug.com/397022
 "deadlock:"
 "base::trace_event::TraceEventTestFixture_ThreadOnceBlocking_Test::TestBody\n"
 
 // http://crbug.com/415472
 "deadlock:base::trace_event::TraceLog::GetCategoryGroupEnabled\n"
 
+// http://crbug.com/490856
+"deadlock:content::TracingControllerImpl::SetEnabledOnFileThread\n"
+
 // http://crbug.com/425057
 "deadlock:webrtc::ViEChannelManagerScoped::ViEChannelManagerScoped\n"
 
 // http://crbug.com/417193
 // Suppressing both AudioContext.{cpp,h}.
 "race:modules/webaudio/AudioContext\n"
 
 // https://code.google.com/p/skia/issues/detail?id=3294
 "race:SkBaseMutex::acquire\n"
 
@@ skipping 15 matching lines @@
 // https://crbug.com/459429
 "race:randomnessPid\n"
 
 // https://crbug.com/454655
 "race:content::BrowserTestBase::PostTaskToInProcessRendererAndWait\n"
 
 // End of suppressions.
 ;  // Please keep this semicolon.
 
 #endif  // THREAD_SANITIZER