Implement stress tool for ibus.

A test-stress.c sends key message each time by client.
Client.h and client.c store modifier key and send key event.
They check ibus-daemon and engine is alive.

Review URL: http://codereview.appspot.com/2204051
Patch from Hirotake Kobayashi <hkobayash@google.com>.

bus/Makefile.am

@@ -47,6 +47,7 @@ AM_LDADD = \
 
 TESTS = \
 	test-matchrule \
+	test-stress \
 	$(NULL)
 xdgautostart_DATA = \
 	ibus.desktop \
@@ -114,6 +115,21 @@ test_matchrule_LDADD = \
 	$(AM_LDADD) \
 	$(NULL)
 
+test_stress_SOURCES = \
+	test-client.c \
+	test-stress.c \
+	$(NULL)
+test_stress_CFLAGS = \
+	$(AM_CFLAGS) \
+	@GTK2_CFLAGS@ \
+	@X11_CFLAGS@ \
+	$(NULL)
+test_stress_LDADD = \
+	$(AM_LDADD) \
+	@GTK2_LIBS@ \
+	@X11_LIBS@ \
+	$(NULL)
+
 EXTRA_DIST = \
 	$(desktop_in_files) \
 	$(NULL)