Method Client.Send(). Add param ctx.

fcm.go

@@ -362,7 +362,7 @@ func (c *Client) doSendEachInBatch(
 			if validateOnly {
 				resp, err = c.Validate(m)
 			} else {
-				resp, err = c.Send(m)
+				resp, err = c.Send(ctx, m)
 			}
 			if err == nil {
 				responses[idx] = MessageSendResponse{
@@ -394,7 +394,7 @@ func (c *Client) doSendEachInBatch(
 	}, nil
 }
 
-func (c *Client) Send(message Message) (string, error) {
+func (c *Client) Send(ctx context.Context, message Message) (string, error) {
 	sendRequest := SendRequest{
 		ValidateOnly: false,
 		Message:      message,