Add the machinery to provide a classic-mode session

A new session is added only when --enable-extensions=classic-mode is
used.

https://bugzilla.gnome.org/show_bug.cgi?id=689285

data/Makefile.am

@@ -0,0 +1,40 @@
+desktopdir = $(datadir)/applications
+desktop_in_in_files = gnome-shell-classic.desktop.in.in
+desktop_in_files = $(desktop_in_in_files:.desktop.in.in=.desktop.in)
+desktop_DATA = $(desktop_in_files:.desktop.in=.desktop)
+
+sessiondir = $(datadir)/gnome-session/sessions
+session_in_in_files = gnome-classic.session.desktop.in.in
+session_in_files = $(session_in_in_files:.session.desktop.in.in=.session.desktop.in)
+session_DATA = $(session_in_files:.session.desktop.in=.session)
+
+xsessiondir = $(datadir)/xsessions
+xsession_in_files = gnome-classic.desktop.in
+xsession_DATA = $(xsession_in_files:.desktop.in=.desktop)
+
+%.desktop.in:%.desktop.in.in
+	$(AM_V_GEN) sed \
+		-e "s|\@bindir\@|$(bindir)|" \
+		-e "s|\@VERSION\@|$(VERSION)|" \
+		$< > $@
+
+%.session.desktop.in: %.session.desktop.in.in
+	$(AM_V_GEN) sed \
+		-e "s|\@libexecdir\@|$(libexecdir)|" \
+		$< > $@
+
+%.session: %.session.desktop.in   $(INTLTOOL_MERGE) $(wildcard $(top_srcdir)/po/*.po) ; LC_ALL=C $(INTLTOOL_MERGE) -d -u -c $(top_builddir)/po/.intltool-merge-cache $(top_srcdir)/po $< $@
+
+@INTLTOOL_DESKTOP_RULE@
+
+EXTRA_DIST = \
+	$(desktop_in_in_files) \
+	$(session_in_in_files) \
+	$(xsession_in_files) \
+	$(NULL)
+
+CLEANFILES = \
+	$(desktop_DATA) \
+	$(session_DATA) \
+	$(xsession_DATA) \
+	$(NULL)

data/gnome-classic.desktop.in

@@ -0,0 +1,7 @@
+[Desktop Entry]
+_Name=GNOME Classic
+_Comment=This session logs you into GNOME Classic
+Exec=gnome-session --session gnome-classic
+TryExec=gnome-session
+Icon=
+Type=Application

data/gnome-classic.session.desktop.in.in

@@ -0,0 +1,5 @@
+[GNOME Session]
+_Name=GNOME Classic
+RequiredComponents=gnome-shell-classic;gnome-settings-daemon;
+IsRunnableHelper=@libexecdir@/gnome-session-check-accelerated
+FallbackSession=gnome-fallback

data/gnome-shell-classic.desktop.in.in

@@ -0,0 +1,17 @@
+[Desktop Entry]
+Type=Application
+_Name=GNOME Shell Classic
+_Comment=Window management and application launching
+Exec=@bindir@/gnome-shell --mode=classic
+TryExec=@bindir@/gnome-shell
+X-GNOME-Bugzilla-Bugzilla=GNOME
+X-GNOME-Bugzilla-Product=gnome-shell
+X-GNOME-Bugzilla-Component=general
+X-GNOME-Bugzilla-Version=@VERSION@
+Categories=GNOME;GTK;Core;
+OnlyShowIn=GNOME;
+NoDisplay=true
+X-GNOME-Autostart-Phase=WindowManager
+X-GNOME-Provides=panel;windowmanager;
+X-GNOME-Autostart-Notify=true
+X-GNOME-AutoRestart=false