MediaStreamSource: verify unlocked state when finalizing.

third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp

Index: third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
diff --git a/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp b/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
index 98a314d3c753aad2b98759a2142bc525fd8e9caf..c65890142bb5e89ae772586390be824b963dc1c5 100644
--- a/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
+++ b/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp
@@ -55,6 +55,13 @@ MediaStreamSource::MediaStreamSource(const String& id,
       m_readyState(readyState),
       m_requiresConsumer(requiresConsumer) {}
 
+MediaStreamSource::~MediaStreamSource() {
+  // Verify that the audio thread isn't consuming audio.
+  // TODO(sof): remove once crbug.com/682945 has been diagnosed.
+  MutexTryLocker tryLocker(m_audioConsumersLock);
+  CHECK(tryLocker.locked());
+}
+
 void MediaStreamSource::setReadyState(ReadyState readyState) {
   if (m_readyState != ReadyStateEnded && m_readyState != readyState) {
     m_readyState = readyState;