Clone MediaStream video tracks correctly with spec-compliant constraints.

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

Index: third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.cpp
diff --git a/third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.cpp b/third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.cpp
index 468c511790c4942c3524d14ec849cd45490669e8..12c07a8161c3f8f0da746f6b6c871ca2e53fdeb0 100644
--- a/third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.cpp
+++ b/third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.cpp
@@ -31,6 +31,8 @@
 
 #include "platform/mediastream/MediaStreamCenter.h"
 
+#include <memory>
+
 #include "platform/mediastream/MediaStreamDescriptor.h"
 #include "platform/mediastream/MediaStreamWebAudioSource.h"
 #include "public/platform/Platform.h"
@@ -40,7 +42,6 @@
 #include "public/platform/WebMediaStreamTrack.h"
 #include "wtf/Assertions.h"
 #include "wtf/PtrUtil.h"
-#include <memory>
 
 namespace blink {
 
@@ -116,6 +117,12 @@ void MediaStreamCenter::didCreateMediaStreamTrack(MediaStreamComponent* track) {
     m_private->didCreateMediaStreamTrack(track);
 }
 
+void MediaStreamCenter::didCloneMediaStreamTrack(MediaStreamComponent* original,
+                                                 MediaStreamComponent* clone) {
+  if (m_private)
+    m_private->didCloneMediaStreamTrack(original, clone);
+}
+
 void MediaStreamCenter::didSetContentHint(MediaStreamComponent* track) {
   if (m_private)
     m_private->didSetContentHint(track);