Added support for enabling GCD, or not, at build time.

remoting/webapp/crd/manifest.json.jinja2

Index: remoting/webapp/crd/manifest.json.jinja2
diff --git a/remoting/webapp/crd/manifest.json.jinja2 b/remoting/webapp/crd/manifest.json.jinja2
index 8f0f59cf154695111d4f5dd0f5f44b533c3721fc..29096ead67ddd88009f50587b43be49824071516 100644
--- a/remoting/webapp/crd/manifest.json.jinja2
+++ b/remoting/webapp/crd/manifest.json.jinja2
@@ -53,7 +53,12 @@
   "oauth2": {
     "client_id": "{{ REMOTING_IDENTITY_API_CLIENT_ID }}",
     "scopes": [
-      "https://www.googleapis.com/auth/chromoting https://www.googleapis.com/auth/googletalk https://www.googleapis.com/auth/userinfo#email"
+      {% if USE_GCD %}
+      "https://www.googleapis.com/auth/clouddevices",
+      {% endif %}
+      "https://www.googleapis.com/auth/chromoting",
+      "https://www.googleapis.com/auth/googletalk",
+      "https://www.googleapis.com/auth/userinfo#email"
     ]
   },
   "sandbox": {