Adds a method to query the nacl architecture in the hangout services extension.

chrome/browser/resources/hangout_services/thunk.js

Index: chrome/browser/resources/hangout_services/thunk.js
diff --git a/chrome/browser/resources/hangout_services/thunk.js b/chrome/browser/resources/hangout_services/thunk.js
index dd2a6511de83fe34941a68999f0953f6b572e082..7e97031cc1e816f766c29643e49fd2605aef6d83 100644
--- a/chrome/browser/resources/hangout_services/thunk.js
+++ b/chrome/browser/resources/hangout_services/thunk.js
@@ -119,6 +119,11 @@ chrome.runtime.onMessageExternal.addListener(
       // chrome.runtime.lastError.
       doSendResponse();
       return false;
+    } else if (method == 'getNaclArchitecture') {
+      chrome.runtime.getPlatformInfo(function(obj) {
+        doSendResponse(obj.nacl_arch);
+      });
+      return true;
     }
     throw new Error('Unknown method: ' + method);
   } catch (e) {