Server side census context plumbing for c++

include/grpc++/server_context.h

@@ -46,6 +46,7 @@
 struct gpr_timespec;
 struct grpc_metadata;
 struct grpc_call;
+struct census_context;
 
 namespace grpc {
 
@@ -116,6 +117,8 @@ class ServerContext {
 
   std::shared_ptr<const AuthContext> auth_context() const;
 
+  const census_context* get_census_context() const;
+
  private:
   friend class ::grpc::testing::InteropContextInspector;
   friend class ::grpc::Server;

src/cpp/server/server_context.cc

@@ -39,6 +39,7 @@
 #include <grpc++/impl/sync.h>
 #include <grpc++/time.h>
 
+#include "src/core/census/grpc_context.h"
 #include "src/core/channel/compress_filter.h"
 #include "src/cpp/common/create_auth_context.h"
 
@@ -179,4 +180,8 @@ std::shared_ptr<const AuthContext> ServerContext::auth_context() const {
   return auth_context_;
 }
 
+const census_context* ServerContext::get_census_context() const {
+  return grpc_census_call_get_context(call_);
+}
+
 }  // namespace grpc