- <rdar://problem/3163393> Safari does not support Windowless mode in Flash

        * Plugins.subproj/WebBaseNetscapePluginView.h:
	Added 'isTransparent' instance variable.

        * Plugins.subproj/WebBaseNetscapePluginView.m:
        (-[WebBaseNetscapePluginView saveAndSetPortStateForUpdate:]):
	When updating a plugin in "windowless" (transparent) mode, clip drawing to the dirty
	region of the opaque ancestor.  This means that a partially-transparent plugin, which
	by definition does not clear its port on redraw, will not overdraw the valid parts
	of its port.
        (-[WebBaseNetscapePluginView sendEvent:]):
	Disabled the "green debug background" for transparent plugins -- since they are not
	expected to cover their entire port every redraw, this debug code makes no sense.
        (-[WebBaseNetscapePluginView setVariable:value:]):
	Implemented -setVariable:value:, which is called from NPN_SetValue() (previously
	unimplemented).
	Right now we only handle NPPVpluginTransparentBool; if we choose to handle the other
	plugin variables, then we may do so here.
        * Plugins.subproj/WebBaseNetscapePluginViewPrivate.h:
	Added SPI for -[WebBaseNetscapePluginView setVariable:value].
        * Plugins.subproj/npapi.m:
        (NPN_SetValue):
	Implemented this function so that plugins may set state (such as window mode).


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@10529 268f45cc-cd09-0410-ab3c-d52691b4dbfc