https://bugs.webkit.org/show_bug.cgi?id=120650

Reviewed by Darin Adler.

No new tests, the code changed doesn't run on OSX yet.

* DerivedSources.make: Add MediaStream idl files.

* Modules/mediastream/LocalMediaStream.h: Mark class as FINAL.

* Modules/mediastream/MediaConstraintsImpl.cpp:
(WebCore::MediaConstraintsImpl::getOptionalConstraints): append -> appendRange so we don't
    need a MediaConstraint copy constructor.

* Modules/mediastream/RTCDataChannel.cpp:
(WebCore::RTCDataChannel::send): Remove an unused parameter name.
* Modules/mediastream/RTCDataChannel.h: ArrayBuffer and ArrayBufferView are in the JSC namespace.

* Modules/mediastream/RTCPeerConnection.cpp:
(WebCore::RTCPeerConnection::RTCPeerConnection): loader() doesn't return a pointer.
(WebCore::RTCPeerConnection::localDescription): Set the ExceptionCode on error.
(WebCore::RTCPeerConnection::remoteDescription): Ditto.

* Modules/mediastream/RTCSessionDescription.cpp:
(WebCore::RTCSessionDescription::setSdp): Remove the unused ExceptionCode parameter.
* Modules/mediastream/RTCSessionDescription.h: Ditto.
* Modules/mediastream/RTCSessionDescription.idl: Ditto.

* Modules/mediastream/RTCStatsResponse.cpp:
(WebCore::RTCStatsResponse::canGetItemsForName): Add so JSRTCStatsResponse::canGetItemsForName
    doesn't cause ref count churn.
* Modules/mediastream/RTCStatsResponse.h: Mark class as FINAL. Declare canGetItemsForName.

* WebCore.xcodeproj/project.pbxproj: Add new files.

* bindings/js/JSRTCStatsResponseCustom.cpp:
(WebCore::JSRTCStatsResponse::canGetItemsForName): Use canGetItemsForName instead of namedItem.
    Use propertyNameToAtomicString instead of propertyNameToString 
(WebCore::JSRTCStatsResponse::nameGetter): Use propertyNameToAtomicString instead of 
    propertyNameToString because namedItem takes an AtomicString.

* platform/mediastream/mac: Added.
* platform/mediastream/mac/MediaStreamCenterMac.cpp: Added.
* platform/mediastream/mac/MediaStreamCenterMac.h: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155057 268f45cc-cd09-0410-ab3c-d52691b4dbfc