Add safety when the .src attribute of an <audio> or <video> element is changed and it's used with t…

Source/WebKit/chromium/src/WebMediaPlayerClientImpl.h

Index: Source/WebKit/chromium/src/WebMediaPlayerClientImpl.h
diff --git a/Source/WebKit/chromium/src/WebMediaPlayerClientImpl.h b/Source/WebKit/chromium/src/WebMediaPlayerClientImpl.h
index ba3513090d17d814b4831bad437f1fb75478533a..8e755fa8a198f9df95d393e8c2df975113f85ed6 100644
--- a/Source/WebKit/chromium/src/WebMediaPlayerClientImpl.h
+++ b/Source/WebKit/chromium/src/WebMediaPlayerClientImpl.h
@@ -231,6 +231,7 @@ private:
     private:
         WebAudioSourceProvider* m_webAudioSourceProvider;
         OwnPtr<AudioClientImpl> m_client;
+        Mutex provideInputLock;
     };
 
     AudioSourceProviderImpl m_audioSourceProvider;