[Mac, iOS] Add source application accounting to AVURLAsset.

[Mac, iOS] Add source application accounting to AVURLAsset.
https://bugs.webkit.org/show_bug.cgi?id=132637

Reviewed by Eric Carlson.

Source/WebCore:
Properly account for the application responisble for data loading by passing the source
application identifier through to AVFoundation through AVURLAsset options.

* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::parseAttribute):
* html/HTMLMediaElement.h:
* platform/graphics/MediaPlayer.cpp:
(WebCore::MediaPlayer::sourceApplicationIdentifier):
* platform/graphics/MediaPlayer.h:
(WebCore::MediaPlayerClient::mediaPlayerSourceApplicationIdentifier):
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
(WebCore::MediaPlayerPrivateAVFoundationObjC::createAVAssetForURL):
* platform/network/NetworkingContext.h:

Source/WebKit/mac:
Add accessor for sourceApplicationIdentifier.

* WebCoreSupport/WebFrameNetworkingContext.h:
* WebCoreSupport/WebFrameNetworkingContext.mm:
(WebFrameNetworkingContext::sourceApplicationIdentifier):

Source/WebKit2:
Add accessor for sourceApplicationIdentifier.

* NetworkProcess/RemoteNetworkingContext.h:
* NetworkProcess/mac/RemoteNetworkingContext.mm:
(WebKit::RemoteNetworkingContext::sourceApplicationIdentifier):
* WebProcess/WebCoreSupport/mac/WebFrameNetworkingContext.h:
* WebProcess/WebCoreSupport/mac/WebFrameNetworkingContext.mm:
(WebKit::WebFrameNetworkingContext::sourceApplicationIdentifier):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@168512 268f45cc-cd09-0410-ab3c-d52691b4dbfc