Spec compliant video constraints for getUserMedia behind flag.

content/renderer/media/media_stream_center.cc

Index: content/renderer/media/media_stream_center.cc
diff --git a/content/renderer/media/media_stream_center.cc b/content/renderer/media/media_stream_center.cc
index bd2c6a53f364f2ece61932a86601f185f56ba21f..283df659d9c55fdb7bfca9b9895a660de88d0c89 100644
--- a/content/renderer/media/media_stream_center.cc
+++ b/content/renderer/media/media_stream_center.cc
@@ -70,17 +70,26 @@ void CreateNativeVideoMediaStreamTrack(
       MediaStreamVideoSource::GetVideoSource(source);
   DCHECK(native_source);
   blink::WebMediaStreamTrack writable_track(track);
-  // TODO(perkj): The constraints to use here should be passed from blink when
-  // a new track is created. For cloning, it should be the constraints of the
-  // cloned track and not the originating source.
-  // Also - source.constraints() returns an uninitialized constraint if the
-  // source is coming from a remote video track. See http://crbug/287805.
-  blink::WebMediaConstraints constraints = source.constraints();
-  if (constraints.isNull())
-    constraints.initialize();
-  writable_track.setTrackData(new MediaStreamVideoTrack(
-      native_source, constraints, MediaStreamVideoSource::ConstraintsCallback(),
-      track.isEnabled()));
+  if (IsOldVideoConstraints()) {
+    // TODO(perkj): The constraints to use here should be passed from blink when
+    // a new track is created. For cloning, it should be the constraints of the
+    // cloned track and not the originating source.
+    // Also - source.constraints() returns an uninitialized constraint if the
+    // source is coming from a remote video track. See http://crbug/287805.
+    blink::WebMediaConstraints constraints = source.constraints();
+    if (constraints.isNull())
+      constraints.initialize();
+    writable_track.setTrackData(new MediaStreamVideoTrack(
+        native_source, constraints,
+        MediaStreamVideoSource::ConstraintsCallback(), track.isEnabled()));
+  } else {
+    // TODO(guidou): All existing uses are without constraints except for the
+    // case of cloning a track. To fix this, create a new function in
+    // MediaStreamCenter specifically for cloning.
+    writable_track.setTrackData(new MediaStreamVideoTrack(
+        native_source, MediaStreamVideoSource::ConstraintsCallback(),
+        track.isEnabled()));
+  }
 }
 
 }  // namespace