Added AdResponseInfo snippet.

samples/HelloWorld/Assets/Snippets/ResponseInfoSnippets.cs

@@ -0,0 +1,43 @@
+using UnityEngine;
+
+using GoogleMobileAds.Api;
+
+namespace GoogleMobileAds.Snippets
+{
+    /// <summary>
+    /// Code snippets used for the developer guides.
+    /// </summary>
+    internal class AdResponseInfoUtility
+    {
+        // [START get_ad_source_name]
+        private string GetAdSourceName(AdapterResponseInfo loadedAdapterResponseInfo)
+        {
+            if (loadedAdapterResponseInfo == null)
+            {
+                return string.Empty;
+            }
+
+            string adSourceName = loadedAdapterResponseInfo.AdSourceName;
+
+            if (adSourceName == "Custom Event")
+            {
+
+                #if UNITY_ANDROID
+                    if (loadedAdapterResponseInfo.AdapterClassName ==
+                        "com.google.ads.mediation.sample.customevent.SampleCustomEvent")
+                    {
+                        adSourceName = "Sample Ad Network (Custom Event)";
+                    }
+                #elif UNITY_IPHONE
+                    if (loadedAdapterResponseInfo.AdapterClassName == "SampleCustomEvent")
+                    {
+                        adSourceName = "Sample Ad Network (Custom Event)";
+                    }
+                #endif
+
+            }
+            return adSourceName;
+        }
+        // [END get_ad_source_name]
+    }
+}