Add ChannelArguments methods for setting max send/recv message size.

include/grpc++/support/channel_arguments.h

@@ -88,6 +88,10 @@ class ChannelArguments {
   /// The given buffer pool will be attached to the constructed channel
   void SetResourceQuota(const ResourceQuota& resource_quota);
 
+  /// Sets the max receive and send message sizes.
+  void SetMaxReceiveMessageSize(int size);
+  void SetMaxSendMessageSize(int size);
+
   /// Set LB policy name.
   /// Note that if the name resolver returns only balancer addresses, the
   /// grpclb LB policy will be used, regardless of what is specified here.

src/cpp/common/channel_arguments.cc

@@ -143,6 +143,14 @@ void ChannelArguments::SetResourceQuota(
                        grpc_resource_quota_arg_vtable());
 }
 
+void ChannelArguments::SetMaxReceiveMessageSize(int size) {
+  SetInt(GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH, size);
+}
+
+void ChannelArguments::SetMaxSendMessageSize(int size) {
+  SetInt(GRPC_ARG_MAX_SEND_MESSAGE_LENGTH, size);
+}
+
 void ChannelArguments::SetLoadBalancingPolicyName(
     const grpc::string& lb_policy_name) {
   SetString(GRPC_ARG_LB_POLICY_NAME, lb_policy_name);