https://bugs.webkit.org/show_bug.cgi?id=79701

Source/WebCore:

Add a playback state to AudioBufferSourceNode so that the user can
tell if the node is scheduled, playing, or finished.

For an AudioContext, add a count of the number of
AudioBufferSourceNode's that are active (playing audio).

Deleted m_isPlaying and m_hasFinished. For the record, m_isPlaying
is the same as a playbackState of SCHEDULED_STATE or PLAYING_STATE.
m_hasFinished is equivalent to a playbackState of FINISHED_STATE.

Patch by Raymond Toy <rtoy@google.com> on 2012-03-19
Reviewed by Chris Rogers.

Test: webaudio/audiobuffersource-playbackState.html

* webaudio/AudioBufferSourceNode.cpp:
(WebCore):
(WebCore::AudioBufferSourceNode::AudioBufferSourceNode):
initialize playbackState, remove m_isPlaying, m_hasFinished.
(WebCore::AudioBufferSourceNode::process): Update playbackState
(WebCore::AudioBufferSourceNode::finish): Update playbackState
(WebCore::AudioBufferSourceNode::noteOn): Update playbackState
(WebCore::AudioBufferSourceNode::noteGrainOn): Update playbackState
(WebCore::AudioBufferSourceNode::noteOff): Use playbackState
* webaudio/AudioBufferSourceNode.h:
(AudioBufferSourceNode): Define states, remove m_isPlaying, m_hasFinished.
(WebCore::AudioBufferSourceNode::playbackState): Added.
* webaudio/AudioBufferSourceNode.idl: Define constants for the
playback state, add attribute playbackState.
* webaudio/AudioContext.cpp:
(WebCore::AudioContext::activeSourceCount): Added.
(WebCore::AudioContext::incrementActiveSourceCount): Added.
(WebCore::AudioContext::decrementActiveSourceCount): Added.
* webaudio/AudioContext.h:
(AudioContext):
* webaudio/AudioContext.idl: Add attribute activeSourceCount.

LayoutTests:

Patch by Raymond Toy <rtoy@google.com> on 2012-03-19
Reviewed by Chris Rogers.

* webaudio/audiobuffersource-playbackState-expected.txt: Added.
* webaudio/audiobuffersource-playbackState.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111239 268f45cc-cd09-0410-ab3c-d52691b4dbfc