Bug 653586 Support mochitest-browser-chrome target for Fennec r=blassey

mobile/build.mk

@@ -81,6 +81,18 @@ deb: package
 upload::
 	@$(MAKE) -C mobile/installer upload
 
+ifdef ENABLE_TESTS
+# Implemented in testing/testsuite-targets.mk
+
+mochitest-browser-chrome:
+	$(RUN_MOCHITEST) --browser-chrome
+	$(CHECK_TEST_ERROR)
+
+mochitest:: mochitest-browser-chrome
+
+.PHONY: mochitest-browser-chrome
+endif
+
 ifeq ($(OS_TARGET),Linux)
 deb: installer
 endif