Add "IsBookmarked" method.

xpfe/components/bookmarks/public/nsIBookmarksService.idl

@@ -32,6 +32,7 @@
 interface nsIBookmarksService : nsISupports
 {
     void	ReadBookmarks();
+    boolean	IsBookmarked(in string aURI);
     void	AddBookmark(in string aURI, in wstring aTitle);
     void	UpdateBookmarkLastVisitedDate(in string aURL);
     string	FindShortcut(in wstring aName);

xpfe/components/bookmarks/src/nsBookmarksService.cpp

@@ -2673,6 +2673,27 @@ nsBookmarksService::AddBookmark(const char *aURI, const PRUnichar *aOptionalTitl
 
 
 
+NS_IMETHODIMP
+nsBookmarksService::IsBookmarked(const char *aURI, PRBool *isBookmarkedFlag)
+{
+	if (!aURI)		return(NS_ERROR_UNEXPECTED);
+	if (!isBookmarkedFlag)	return(NS_ERROR_UNEXPECTED);
+	if (!mInner)		return(NS_ERROR_UNEXPECTED);
+
+	*isBookmarkedFlag = PR_FALSE;
+
+	nsresult			rv;
+	nsCOMPtr<nsIRDFResource>	bookmark;
+	if (NS_SUCCEEDED(rv = gRDF->GetResource(aURI, getter_AddRefs(bookmark))))
+	{
+		rv = mInner->HasAssertion(bookmark, kRDF_type, kNC_Bookmark,
+			PR_TRUE, isBookmarkedFlag);
+	}
+	return(rv);
+}
+
+
+
 NS_IMETHODIMP
 nsBookmarksService::UpdateBookmarkLastVisitedDate(const char *aURL)
 {