build: add code coverage

Add code coverage to build

Change-Id: I198d8bc9e6b99556582c14fc4dfd4c835150b5e0
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/Makefile.am b/test/Makefile.am
index 82b61c5..a039e01 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -1,12 +1,16 @@
 AM_CPPFLAGS = \
 	-I$(top_srcdir)/ \
 	$(GTEST_CFLAGS) \
-	$(GMOCK_CFLAGS)
+	$(GMOCK_CFLAGS) \
+	$(CODE_COVERAGE_CPPFLAGS)
+AM_CFLAGS = $(CODE_COVERAGE_CFLAGS)
+AM_CXXFLAGS = $(CODE_COVERAGE_CXXFLAGS)
 AM_LDFLAGS = \
 	$(GTEST_LIBS) \
 	$(GMOCK_LIBS) \
 	-lgmock_main \
-	$(OESDK_TESTCASE_FLAGS)
+	$(OESDK_TESTCASE_FLAGS) \
+	$(CODE_COVERAGE_LIBS)
 
 check_PROGRAMS =
 TESTS = $(check_PROGRAMS)