Bs*.h includes cutils/atrace.h.

Bs* uses atrace methods, but does not include the header even
implicitly.

Bug: 33669138

Test: mma
Change-Id: Ic5abe51b0550049a80e324b256fa035ee49f51e9
diff --git a/generateCpp.cpp b/generateCpp.cpp
index 01aeaf9..ad56735 100644
--- a/generateCpp.cpp
+++ b/generateCpp.cpp
@@ -1507,6 +1507,7 @@
     getPackageAndVersionComponents(
             &packageComponents, false /* cpp_compatible */);
 
+    out << "#include <cutils/trace.h>\n";
     out << "#include <future>\n";
 
     generateCppPackageInclude(out, mPackage, ifaceName);