RealtimeMediaSource should be ThreadSafeRefCounted

https://bugs.webkit.org/show_bug.cgi?id=181649

Patch by Youenn Fablet <youenn@apple.com> on 2018-01-15
Reviewed by Eric Carlson.

Difficult to write a test as this is really racy.
RealtimeIncomingVideoSourceCocoa::OnFrame is taking a reference on a background thread
to send a task to the main thread.
This requires it to be thread safe ref counted.

* platform/mediastream/RealtimeMediaSource.h:

Canonical link: https://commits.webkit.org/197503@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@226951 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/ChangeLog

@@ -1,3 +1,17 @@
+2018-01-15  Youenn Fablet  <youenn@apple.com>
+
+        RealtimeMediaSource should be ThreadSafeRefCounted
+        https://bugs.webkit.org/show_bug.cgi?id=181649
+
+        Reviewed by Eric Carlson.
+
+        Difficult to write a test as this is really racy.
+        RealtimeIncomingVideoSourceCocoa::OnFrame is taking a reference on a background thread
+        to send a task to the main thread.
+        This requires it to be thread safe ref counted.
+
+        * platform/mediastream/RealtimeMediaSource.h:
+
 2018-01-15  Philippe Normand  <pnormand@igalia.com>
 
         Prevent useless MediaPlayer mute state notifications

Source/WebCore/platform/mediastream/RealtimeMediaSource.h

@@ -41,7 +41,7 @@
 #include "MediaSample.h"
 #include "PlatformLayer.h"
 #include "RealtimeMediaSourceCapabilities.h"
-#include <wtf/RefCounted.h>
+#include <wtf/ThreadSafeRefCounted.h>
 #include <wtf/Vector.h>
 #include <wtf/WeakPtr.h>
 #include <wtf/text/WTFString.h>
@@ -62,7 +62,7 @@ class RealtimeMediaSourceSettings;
 
 struct CaptureSourceOrError;
 
-class WEBCORE_EXPORT RealtimeMediaSource : public RefCounted<RealtimeMediaSource> {
+class WEBCORE_EXPORT RealtimeMediaSource : public ThreadSafeRefCounted<RealtimeMediaSource> {
 public:
     class Observer {
     public: