Make MediaResourceLoader behave more like a CachedResourceLoader.

Make MediaResourceLoader behave more like a CachedResourceLoader.
https://bugs.webkit.org/show_bug.cgi?id=154117

Reviewed by Alex Christensen.

MediaResourceLoader currently can only handle a single request at a time. Split the class
into two, MediaResourceLoader and MediaResource, effectively wrapping CachedResourceLoader
and CachedRawResource respectively. With this devision, the same loader can be used to issue
multiple simultaneous resource requests.

This necessecitates splitting PlatformMediaResource into two classes as well.  To simplify
the HTMLMediaElement, MediaPlayer, and MediaPlayerClient APIs, do not require a client
object when creating the loader; instead, the client is required to create the resource.
This also matches the CachedRawResource API.

* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::mediaPlayerCreateResourceLoader): Remove the client parameter.
* html/HTMLMediaElement.h:
* loader/MediaResourceLoader.cpp:
(WebCore::MediaResourceLoader::MediaResourceLoader):
(WebCore::MediaResourceLoader::~MediaResourceLoader):
(WebCore::MediaResourceLoader::requestResource): Renamed from start().
(WebCore::MediaResourceLoader::removeResource): Remove resource from live resource list.
(WebCore::MediaResource::create): Utility factory.
(WebCore::MediaResource::MediaResource):
(WebCore::MediaResource::~MediaResource):
(WebCore::MediaResource::stop): Moved from MediaResourceLoader.
(WebCore::MediaResource::setDefersLoading): Ditto.
(WebCore::MediaResource::responseReceived): Ditto.
(WebCore::MediaResource::redirectReceived): Ditto.
(WebCore::MediaResource::dataSent): Ditto.
(WebCore::MediaResource::dataReceived): Ditto.
(WebCore::MediaResource::notifyFinished): Ditto.
(WebCore::MediaResource::getOrCreateReadBuffer): Ditto.
* loader/MediaResourceLoader.h:
* platform/graphics/MediaPlayer.cpp:
(WebCore::MediaPlayer::createResourceLoader):
* platform/graphics/MediaPlayer.h:
(WebCore::MediaPlayerClient::mediaPlayerCreateResourceLoader):
* platform/graphics/PlatformMediaResourceLoader.h:
(WebCore::PlatformMediaResourceClient::~PlatformMediaResourceClient): Renamed from PlatformMediaResourceLoaderClient.
(WebCore::PlatformMediaResourceClient::responseReceived): Client methods now take a reference to the resource.
(WebCore::PlatformMediaResourceClient::redirectReceived): Ditto.
(WebCore::PlatformMediaResourceClient::dataSent): Ditto.
(WebCore::PlatformMediaResourceClient::dataReceived): Ditto.
(WebCore::PlatformMediaResourceClient::accessControlCheckFailed): Ditto.
(WebCore::PlatformMediaResourceClient::loadFailed): Ditto.
(WebCore::PlatformMediaResourceClient::loadFinished): Ditto.
(WebCore::PlatformMediaResourceClient::getOrCreateReadBuffer): Ditto.
(WebCore::PlatformMediaResourceLoader::PlatformMediaResourceLoader): Ditto.
(WebCore::PlatformMediaResource::PlatformMediaResource):
(WebCore::PlatformMediaResource::~PlatformMediaResource):
(WebCore::PlatformMediaResource::setClient):
* platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:
(webKitWebSrcStart):
(webKitWebSrcNeedData):
(webKitWebSrcEnoughData):
(CachedResourceStreamingClient::getOrCreateReadBuffer):
(CachedResourceStreamingClient::responseReceived):
(CachedResourceStreamingClient::dataReceived):
(CachedResourceStreamingClient::accessControlCheckFailed):
(CachedResourceStreamingClient::loadFailed):
(CachedResourceStreamingClient::loadFinished):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@196442 268f45cc-cd09-0410-ab3c-d52691b4dbfc