adding GetRootCommandDispatcher to nsPIDOMWindow for utility.

Needed for beta2+ bug 38673. r=hyatt

dom/public/base/nsPIDOMWindow.h

@@ -28,6 +28,9 @@
 #include "nsString.h"
 #include "nsIScriptContext.h"
 #include "nsIDOMLocation.h"
+#include "nsPIDOMWindow.h"
+#include "nsIDOMXULCommandDispatcher.h"
+#include "nsIDocument.h"
 
 class nsIDocShell;
 class nsIDOMWindow;
@@ -51,6 +54,10 @@ public:
   // This is private because activate/deactivate events are not part of the DOM spec.
   NS_IMETHOD Activate() = 0;
   NS_IMETHOD Deactivate() = 0;
+
+  NS_IMETHOD GetRootCommandDispatcher (
+    nsIDocument * aDoc,
+    nsIDOMXULCommandDispatcher ** aDispatcher)=0;
 };
 
 #endif // nsPIDOMWindow_h__

dom/src/base/nsGlobalWindow.cpp

@@ -2603,6 +2603,38 @@ NS_IMETHODIMP GlobalWindowImpl::Deactivate()
    return NS_OK;
 }
 
+NS_IMETHODIMP GlobalWindowImpl::GetRootCommandDispatcher (
+  nsIDocument * aDoc,
+  nsIDOMXULCommandDispatcher ** aDispatcher)
+{
+	if(!aDispatcher)
+		return NS_ERROR_FAILURE;
+
+	*aDispatcher = nsnull;
+
+	if(!aDoc)
+		return NS_ERROR_FAILURE;
+
+	nsCOMPtr<nsIDOMXULCommandDispatcher> commandDispatcher;
+	nsCOMPtr<nsIScriptGlobalObject> ourGlobal;
+	aDoc->GetScriptGlobalObject(getter_AddRefs(ourGlobal));
+	nsCOMPtr<nsIDOMWindow> rootWindow;
+	nsCOMPtr<nsPIDOMWindow> ourWindow = do_QueryInterface(ourGlobal);
+	if(ourWindow) {
+	  ourWindow->GetPrivateRoot(getter_AddRefs(rootWindow));
+	  if(rootWindow) {
+		nsCOMPtr<nsIDOMDocument> rootDocument;
+		rootWindow->GetDocument(getter_AddRefs(rootDocument));
+
+		nsCOMPtr<nsIDOMXULDocument> xulDoc = do_QueryInterface(rootDocument);
+		if(xulDoc) {
+		  xulDoc->GetCommandDispatcher(aDispatcher);
+		}
+	  }
+	}
+	return NS_OK;
+}
+
 //*****************************************************************************
 // GlobalWindowImpl::nsIDOMViewCSS
 //*****************************************************************************   

dom/src/base/nsGlobalWindow.h

@@ -151,6 +151,11 @@ public:
    NS_IMETHOD Activate();
    NS_IMETHOD Deactivate();
 
+   NS_IMETHOD GetRootCommandDispatcher (
+     nsIDocument * aDoc,
+     nsIDOMXULCommandDispatcher ** aDispatcher);
+
+
    // nsIDOMViewCSS
    NS_DECL_IDOMVIEWCSS