remote-search: add an org.gnome.ShellSearchProvider2 dbus interface

We are going to change the interface, so add a new version of it.
Providers will need to opt-in to the new API.
A summary of the differences compared to the previous API:
- ActivateResult() now also takes the search terms and a timestamp as
  parameters
- a new LaunchSearch() method is added

https://bugzilla.gnome.org/show_bug.cgi?id=689735

docs/reference/shell/Makefile.am

@@ -82,9 +82,17 @@ doc-gen-org.gnome.Shell.SearchProvider.xml: $(top_srcdir)/data/org.gnome.ShellSe
 	--generate-docbook doc-gen				\
 	$(top_srcdir)/data/org.gnome.ShellSearchProvider.xml
 
+doc-gen-org.gnome.Shell.SearchProvider2.xml: $(top_srcdir)/data/org.gnome.ShellSearchProvider2.xml
+	gdbus-codegen 						\
+	--interface-prefix org.gnome.ShellSearchProvider2. 	\
+	--generate-docbook doc-gen				\
+	$(top_srcdir)/data/org.gnome.ShellSearchProvider2.xml
+
 # Extra SGML files that are included by $(DOC_MAIN_SGML_FILE).
 # e.g. content_files=running.sgml building.sgml changes-2.0.sgml
-content_files= doc-gen-org.gnome.Shell.SearchProvider.xml
+content_files= \
+	doc-gen-org.gnome.Shell.SearchProvider.xml	\
+	doc-gen-org.gnome.Shell.SearchProvider2.xml
 
 # SGML files where gtk-doc abbrevations (#GtkWidget) are expanded
 # These files must be listed here *and* in content_files

docs/reference/shell/shell-docs.sgml.in

@@ -44,6 +44,7 @@
   <chapter>
     <title>Integration helpers and utilities</title>
     <xi:include href="doc-gen-org.gnome.Shell.SearchProvider.xml"/>
+    <xi:include href="doc-gen-org.gnome.Shell.SearchProvider2.xml"/>
     <xi:include href="xml/shell-global.xml"/>
     <xi:include href="xml/shell-wm.xml"/>
     <xi:include href="xml/shell-xfixes-cursor.xml"/>