Generate client-side headers

Test: Ran aidl-cpp
Bug: 23599760
Change-Id: I31ca5be9dd1274ba81ea6a7110e9f2005f86855d
Signed-off-by: Casey Dahlin <sadmac@google.com>
diff --git a/Android.mk b/Android.mk
index de15a4a..f730731 100644
--- a/Android.mk
+++ b/Android.mk
@@ -81,6 +81,7 @@
 LOCAL_SRC_FILES := \
     ast_cpp_unittest.cpp \
     ast_java_unittest.cpp \
+    generate_cpp_unittest.cpp \
     options_unittest.cpp \
     parse_helpers_unittest.cpp \
     test_main.cpp \