increasing and decreasing the volume by 1/10 of the range or, when
combined with the Option key, all the way up or down.

Reviewed by Mark Rowe.

Made the volume buttons in the full-screen video HUD match the behavior
of their equivalents in the QuickTime Player HUD by turning the volume
all the way up or down.

Made the volume slider update immediately when the keyboard or volume
buttons are used to change the volume, rather than at the nearest 1/4
second interval.

Made the elapsed and remaining time displays update immediately when the
play head is dragged across the timeline, rather than at 1/4 second
intervals.

* WebView/WebVideoFullscreenHUDWindowController.mm:
(-[WebVideoFullscreenHUDWindowController keyDown:]): Handle the up and
down arrow keys.
(-[WebVideoFullscreenHUDWindowController windowDidLoad]): Changed the
actions of the volume up and volume down buttons.
(-[WebVideoFullscreenHUDWindowController setCurrentTime:]): Call
-updateTime.
(-[WebVideoFullscreenHUDWindowController setVolumeToZero:]): Added this
action for the volume down button.
(-[WebVideoFullscreenHUDWindowController setVolumeToMaximum:]): Added
this action for the volume up button.
(-[WebVideoFullscreenHUDWindowController decrementVolume]): No longer
and action method.
(-[WebVideoFullscreenHUDWindowController incrementVolume]): Ditto.
(-[WebVideoFullscreenHUDWindowController setVolume:]): Call
-updateVolume.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@50399 268f45cc-cd09-0410-ab3c-d52691b4dbfc