Need a way for NPAPI plug-ins to open preference panes
https://bugs.webkit.org/show_bug.cgi?id=116173
<rdar://problem/13503848>

Reviewed by Sam Weinig.

* PluginProcess/PluginControllerProxy.h:
Add openPluginPreferencePane().

* PluginProcess/mac/PluginControllerProxyMac.mm:
(WebKit::PluginControllerProxy::openPluginPreferencePane):
Send OpenPluginPreferencePane to the UI process.

* Shared/Plugins/Netscape/mac/NetscapePluginModuleMac.mm:
(WebKit::NetscapePluginModule::getPluginInfo):
Get the preference pane path.

* Shared/Plugins/PluginModuleInfo.h:
Add preferencePanePath member variable.

* UIProcess/Plugins/PluginProcessProxy.h:
Add openPluginPreferencePane message handler.

* UIProcess/Plugins/PluginProcessProxy.messages.in:
ADd OpenPluginPreferencePane message.

* UIProcess/Plugins/mac/PluginProcessProxyMac.mm:
(WebKit::PluginProcessProxy::openPluginPreferencePane):
Get the path to the preference pane and use LS to open it.

* WebKit2.xcodeproj/project.pbxproj:
Add new files.

* WebProcess/Plugins/Netscape/NetscapeBrowserFuncs.cpp:
(WebKit::NPN_GetValue):
Handle WKNVPlugInContainer.

* WebProcess/Plugins/Netscape/NetscapePlugin.h:
Add WKNVPlugInContainer member variable.

* WebProcess/Plugins/Netscape/mac/NetscapePluginMac.mm:
(WebKit::NetscapePlugin::openPluginPreferencePane):
Call through to the plug-in controller.

(WebKit::NetscapePlugin::plugInContainer):
Create a WKNPAPIPlugInContainer object if necessary.

(WebKit::NetscapePlugin::platformDestroy):
Invalidate the WKNPAPIPlugInContainer object.

* WebProcess/Plugins/Netscape/mac/WKNPAPIPlugInContainer.h:
New file with the protocol definition.

* WebProcess/Plugins/Netscape/mac/WKNPAPIPlugInContainer.mm:
(-[WKNPAPIPlugInContainer dealloc]):
Assert that the plug-in is null (that we've been invalidated).

(-[WKNPAPIPlugInContainer _invalidate]):
Set the plug-in to null.

(-[WKNPAPIPlugInContainer openPlugInPreferencePane]):
Call through to the plug-in.

* WebProcess/Plugins/Netscape/mac/WKNPAPIPlugInContainerInternal.h:
New file with the interface declaration for the object that implements the protocol.

* WebProcess/Plugins/PluginController.h:
Add openPluginPreferencePane member function.

* WebProcess/Plugins/PluginView.cpp:
(WebKit::PluginView::openPluginPreferencePane):
Add stub; this should never be called since we always go through the UI process.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150133 268f45cc-cd09-0410-ab3c-d52691b4dbfc