Bring WebKit up to speed with latest Encrypted Media spec.
https://bugs.webkit.org/show_bug.cgi?id=97037

Reviewed by Eric Carlson.

Source/JavaScriptCore:

Define the ENABLE_ENCRYPTED_MEDIA_V2 setting.

* Configurations/FeatureDefines.xcconfig:

Source/WebCore:

The most recent version of the Encrypted Media Extensions spec breaks functionality out of the
HTMLMediaElement and into new MediaKeys and MediaKeySession classes. Since the CDM functionality
has been pulled out of the media element, we create a proxy CDM class and factory system for
creating specific CDM key system implementations. The spec also breaks out MediaKeyEvent
into distinct event classes, MediaKeyNeededEvent and MediaKeyMessageEvent, for needkey and
keymessage events, respectively.

Tests: media/encrypted-media/encrypted-media-v2-events.html
       media/encrypted-media/encrypted-media-v2-syntax.html

CDM is a proxy class (a la MediaPlayer) for a specific CDMPrivateInterface implementation. A CDM
implementation is registered with the CDMFactory and will be created if that implementation supports
the key system passed into the MediaKeys constructor. CDMSession is a pure-virtual interface exposed
by concrete CDMPrivate subclasses.  Its lifetime is owned by MediaKeySession.
* Modules/encryptedmedia/CDM.cpp: Added.
(WebCore::installedCDMFactories): Initialize all the known CDM subtypes. Ports will add CDM implementations here.
(WebCore::CDM::registerCDMFactory): Registers a new CDMFactory using the passed in function pointers.
(WebCore::CDMFactoryForKeySystem): Return the first CDM factory which supports the requested key system.
(WebCore::CDM::supportsKeySystem): Walk the installed CDMs and ask if the given key system is supported.
(WebCore::CDM::supportsKeySystemMIMETypeAndCodec): Ditto, with an additional MIME type and codec string.
(WebCore::CDM::create): Simple constructor wrapper.
(WebCore::CDM::CDM): Simple constructor; calls bestCDMForKeySystem() to create it's private implementation.
(WebCore::CDM::~CDM): Simple destructor.
(WebCore::CDM::createSession): Creates a new CDMSession.
* Modules/encryptedmedia/CDM.h: Added.
(WebCore::CDM::keySystem): Simple accessor for m_keySystem.
(WebCore::CDMSession::CDMSession): Simple constructor.
(WebCore::CDMSession::~CDMSession): Simple destructor.
* Modules/encryptedmedia/CDMPrivate.h: Added.
(WebCore::CDMPrivateInterface::CDMPrivateInterface): Simple constructor.
(WebCore::CDMPrivateInterface::~CDMPrivateInterface): Simple destructor.

The new classes, MediaKeyMessageEvent and MediaKeyNeededEvent, take distinct subsets of the initializers of
the original MediaKeyMessageEvent.
* Modules/encryptedmedia/MediaKeyMessageEvent.cpp: Copied from Source/WebCore/html/MediaKeyEvent.cpp.
(WebCore::MediaKeyMessageEventInit::MediaKeyMessageEventInit): Initializer now only takes message and destinationURL
    parameters.
(WebCore::MediaKeyMessageEvent::MediaKeyMessageEvent): Simple constructor.
(WebCore::MediaKeyMessageEvent::~MediaKeyMessageEvent): Simple destructor.
(WebCore::MediaKeyMessageEvent::interfaceName): Standard interfaceName.
* Modules/encryptedmedia/MediaKeyMessageEvent.h: Copied from Source/WebCore/html/MediaKeyEvent.h.
(WebCore::MediaKeyMessageEvent::create): Simple construction wrapper.
(WebCore::MediaKeyMessageEvent::message): Simple accessor for m_message.
(WebCore::MediaKeyMessageEvent::destinationURL): Simple accessor for m_destinationURL.
* Modules/encryptedmedia/MediaKeyMessageEvent.idl: Copied from Source/WebCore/html/MediaKeyEvent.idl.
* Modules/encryptedmedia/MediaKeyNeededEvent.cpp: Copied from Source/WebCore/html/MediaKeyEvent.h.
(WebCore::MediaKeyNeededEventInit::MediaKeyNeededEventInit): Initializer now only takes initData parameter.
(WebCore::MediaKeyNeededEvent::MediaKeyNeededEvent): Simple constructor.
(WebCore::MediaKeyNeededEvent::~MediaKeyNeededEvent): Simple destructor.
(WebCore::MediaKeyNeededEvent::interfaceName): Standard interfaceName.
* Modules/encryptedmedia/MediaKeyNeededEvent.h: Copied from Source/WebCore/html/MediaKeyEvent.h.
(WebCore::MediaKeyNeededEvent::create): Simple construction wrapper.
(WebCore::MediaKeyNeededEvent::initData): Simple accessor for m_initData.
* Modules/encryptedmedia/MediaKeyNeededEvent.idl: Copied from Source/WebCore/html/MediaKeyEvent.idl.

MediaKeySession is a new class that maps keys and key requests to a given session ID:
* Modules/encryptedmedia/MediaKeySession.cpp: Added.
(WebCore::MediaKeySession::create): Simple construction wrapper.
(WebCore::MediaKeySession::MediaKeySession): Simple constructor.
(WebCore::MediaKeySession::~MediaKeySession): Simple destructor; calls close().
(WebCore::MediaKeySession::setError): Simple setter for m_error;
(WebCore::MediaKeySession::close): Tell the CDM to clear any saved session keys.
(WebCore::MediaKeySession::generateKeyRequest): Start a one-shot timer, handled in keyRequestTimerFired.
(WebCore::MediaKeySession::keyRequestTimerFired): Follow the steps in the spec; ask the CDM to generate a key request.
(WebCore::MediaKeySession::addKey): Start a one-shot timer, handled in addKeyTimerFired.
(WebCore::MediaKeySession::addKeyTimerFired): Follow the steps in the spec; provide the key data to the CDM.
* Modules/encryptedmedia/MediaKeySession.h: Added.
(WebCore::MediaKeySession::keySystem): Simple accessor for m_keySystem.
(WebCore::MediaKeySession::sessionId): Simple accessor for m_sessionId.
(WebCore::MediaKeySession::error): Simple accessor for m_error;
* Modules/encryptedmedia/MediaKeySession.idl:

MediaKeySession inherits from EventTarget, and must override the pure virtual functions in that class:
* Modules/encryptedmedia/MediaKeySession.cpp: Added.
(WebCore::MediaKeySession::interfaceName):
* Modules/encryptedmedia/MediaKeySession.h: Added.
(WebCore::MediaKeySession::refEventTarget):
(WebCore::MediaKeySession::derefEventTarget):
(WebCore::MediaKeySession::eventTargetData):
(WebCore::MediaKeySession::ensureEventTargetData):
(WebCore::MediaKeySession::scriptExecutionContext):

MediaKeys is a new class that encapsulates a CDM and a number of key sessions:
* Modules/encryptedmedia/MediaKeys.cpp: Added.
(WebCore::MediaKeys::create): Throw an exception if the key system parameter is unsupported; create a CDM object
    and a new MediaKeys session.
(WebCore::MediaKeys::MediaKeys): Simple constructor.
(WebCore::MediaKeys::~MediaKeys): Simple destructor.
(WebCore::MediaKeys::createSession): Follow the spec and create a new key session.
* Modules/encryptedmedia/MediaKeys.h: Added.
* Modules/encryptedmedia/MediaKeys.idl: Copied from Source/WebCore/html/MediaError.idl.

Provide a new interface to HTMLMediaElement for MediaPlayer which does not require a sessionId or a key system:
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::mediaPlayerKeyNeeded):
* platform/graphics/MediaPlayer.cpp:
(WebCore::MediaPlayer::keyNeeded):

MediaKeyError now has a systemCode parameter and member variable.
* html/MediaKeyError.h:
(WebCore::MediaKeyError::create): Take a systemCode parameter with a default (0) value.
(WebCore::MediaKeyError::MediaKeyError): Ditto.
(WebCore::MediaKeyError::systemCode): Simple accessor for m_systemCode.
* html/MediaKeyError.idl:

Add new methods to HTMLMediaElement to support MediaKeys. Support different initializer
for the MediaKeyNeededEvent.
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::setMediaKeys): Simple setter for m_mediaKeys.
(WebCore::HTMLMediaElement::mediaPlayerKeyNeeded): This version takes fewer parameters
    than the deprecated version.
* html/HTMLMediaElement.h:
(WebCore::HTMLMediaElement::mediaKeys): Simple accessor for m_mediaKeys.
* html/HTMLMediaElement.idl: Add the mediaKeys attribute.

Add an ENABLE(ENCRYPTED_MEDIA_V2) check to the existing ENABLE(ENCRYPTED_MEDIA) one:
* html/MediaError.h:
* html/MediaError.idl:
* platform/graphics/MediaPlayer.cpp:
(WebCore::bestMediaEngineForTypeAndCodecs):
(WebCore::MediaPlayer::supportsType):
* platform/graphics/MediaPlayer.h:
(WebCore::MediaPlayer::keyNeeded): This version takes fewer parameters than the
    deprecated version.

Support the new version of canPlayType which takes an extra parameter:
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.h:
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
(WebCore::MediaPlayerPrivateAVFoundationObjC::registerMediaEngine):
(WebCore::MediaPlayerPrivateAVFoundationObjC::extendedSupportsType):
* platform/graphics/mac/MediaPlayerPrivateQTKit.h:
* platform/graphics/mac/MediaPlayerPrivateQTKit.mm:
(WebCore::MediaPlayerPrivateQTKit::registerMediaEngine):
(WebCore::MediaPlayerPrivateQTKit::extendedSupportsType):

Add a mock CDM for use within DRT and WKTR to test the MediaKeys and MediaKeySession
APIs and events:
* testing/Internals.cpp:
(WebCore::Internals::initializeMockCDM): Add the MockCDM class to the CDM factories.
* testing/Internals.h:
* testing/Internals.idl: Add the initializeMockCDM() method.
* testing/MockCDM.cpp: Added.
(WebCore::MockCDM::supportsKeySystem): Only supports the 'com.webcore.mock' key system.
(WebCore::MockCDM::supportsMIMEType): Only supports the 'video/mock' mime type.
(WebCore::initDataPrefix): Static method which returns a Uint8Array containing 'mock'.
(WebCore::keyPrefix): Static method which returns a Uint8Array containing 'key'.
(WebCore::keyRequest): Static method which returns a Uint8Array containing 'request'.
(WebCore::generateSessionId): Return a monotonically increasing number.
(WebCore::MockCDMSession::MockCDMSession): Simple constructor.
(WebCore::MockCDMSession::generateKeyRequest): Ignores the parameters and returns a keyRequest() array.
(WebCore::MockCDMSession::releaseKeys): No-op.
(WebCore::MockCDMSession::addKey): Checks that the key starts with the keyPrefix() array.
* testing/MockCDM.h: Added.
(WebCore::MockCDM::create):
(WebCore::MockCDM::~MockCDM): Simple destructor.
(WebCore::MockCDM::MockCDM): Simple constructor.

Add the new classes to the built system:
* Configurations/FeatureDefines.xcconfig:
* DerivedSources.make:
* WebCore.exp.in:
* WebCore.xcodeproj/project.pbxproj:

Miscelaneous changes:
* dom/EventNames.in: Add the two new event types, MediaKeyMessageEvent and MediaKeyNeededEvent.
* dom/EventTargetFactory.in: Add the new EventTarget, MediaKeySession.
* page/DOMWindow.idl: Add constructors for the new classes to the window object.

Source/WTF:

Define the ENABLE_ENCRYPTED_MEDIA_V2 setting.

* wtf/Platform.h:

LayoutTests:

Added new tests for the updated Encrypted Media Extensions spec.

* media/encrypted-media/encrypted-media-v2-events-expected.txt: Added.
* media/encrypted-media/encrypted-media-v2-events.html: Added.
* media/encrypted-media/encrypted-media-v2-syntax-expected.txt: Added.
* media/encrypted-media/encrypted-media-v2-syntax.html: Added.
* platform/Chromium/TestExpectations: Skip the new media/encrypted-media/ v2 tests.
* platform/mac/media/encrypted-media/encrypted-media-can-play-type-expected.txt: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142327 268f45cc-cd09-0410-ab3c-d52691b4dbfc