Set RequestAttributes for requests sent to the lex bot (#830)

* Set RequestAttributes for requests sent to the bot

* Changelog updates

Author: desokroshan

CHANGELOG.md

@@ -28,6 +28,9 @@
 * **AWS IoT**
   * Fixed the timestamp used for signing requests to AWS IoT by accounting for the offset specified in `SDKGlobalConfiguration`. See [issue #814](https://github.com/aws-amplify/aws-sdk-android/issues/814)
 
+* **Amazon Lex**
+  * Set user-specified `RequestAttributes` for the `PostContentRequest` sent to Amazon Lex bots. See [issue #801](https://github.com/aws-amplify/aws-sdk-android/issues/801)
+
 ## [Release 2.12.6](https://github.com/aws/aws-sdk-android/releases/tag/release_v2.12.6)
 
 ### Misc. Updates

aws-android-sdk-lex/src/main/java/com/amazonaws/mobileconnectors/lex/interactionkit/utils/CreateLexServiceRequest.java

@@ -121,6 +121,11 @@ private static PostContentRequest generateRequestInternal(Map<String, String> se
 
         request.setSessionAttributes(mapToBase64(newSessionAttributes));
 
+        // Set the request attributes
+        if (requestAttributes != null) {
+            request.setRequestAttributes(mapToBase64(requestAttributes));
+        }
+
         if (interactionConfig.getUserId() == null || interactionConfig.getUserId().isEmpty()) {
             final CognitoCredentialsProvider cognitoCredentialsProvider = (CognitoCredentialsProvider) credentialsProvider;
             request.setUserId(cognitoCredentialsProvider.getIdentityId());