Set AVURLAssetUsesNoPersistentCacheKey on AVAsset to match caching policy.

Set AVURLAssetUsesNoPersistentCacheKey on AVAsset to match caching policy.
https://bugs.webkit.org/show_bug.cgi?id=155117
rdar://problem/6802240

Patch by Jeremy Jones <jeremyj@apple.com> on 2016-03-10
Reviewed by Simon Fraser.

Source/WebCore:

No new tests because no new functionality was added.

This will prevent persistent media caches when webkit is using in memory caching.

* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::mediaPlayerShouldUsePersistentCache): Added.
* html/HTMLMediaElement.h: Declare mediaPlayerShouldUsePersistentCache().
* page/ChromeClient.h: Declare mediaPlayerShouldUsePersistentCache().
* platform/graphics/MediaPlayer.h:
(WebCore::MediaPlayerClient::mediaPlayerShouldUsePersistentCache): Added.
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
(WebCore::MediaPlayerPrivateAVFoundationObjC::createAVAssetForURL): Set property on AVAssetOptions.

Source/WebKit/mac:

Implement mediaShouldUsePersistentCache to disable media caching when NSURLCache is disabled.

* WebCoreSupport/WebChromeClient.h:
* WebCoreSupport/WebChromeClient.mm:
(WebChromeClient::mediaShouldUsePersistentCache): Added.

Source/WebKit2:

Make AVAsset AVURLAssetUsesNoPersistentCacheKey match !m_websiteDataStore->isPersistent()
This will prevent persistent media caches when webkit is using in-memory caching.

* Shared/WebPageCreationParameters.cpp: Add mediaShouldUsePersistentCache.
(WebKit::WebPageCreationParameters::encode):
(WebKit::WebPageCreationParameters::decode):
* Shared/WebPageCreationParameters.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::creationParameters): Add mediaShouldUsePersistentCache.
* WebProcess/WebCoreSupport/WebChromeClient.cpp:
(WebKit::WebChromeClient::mediaShouldUsePersistentCache): Added.
* WebProcess/WebCoreSupport/WebChromeClient.h:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::m_mediaUsesPersistentCache): Added.
* WebProcess/WebPage/WebPage.h:
(WebKit::WebPage::mediaShouldUsePersistentCache): Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@197990 268f45cc-cd09-0410-ab3c-d52691b4dbfc