Do not report Observatory analytics when running in Dart

runtime/observatory/lib/src/app/analytics.dart

Index: runtime/observatory/lib/src/app/analytics.dart
diff --git a/runtime/observatory/lib/src/app/analytics.dart b/runtime/observatory/lib/src/app/analytics.dart
index 74efc7f42b6b2bf4d717d85dc769f7f05ebee0dd..cb6a91fbff4e06498bfe6de494a8a48ff0209bac 100644
--- a/runtime/observatory/lib/src/app/analytics.dart
+++ b/runtime/observatory/lib/src/app/analytics.dart
@@ -19,8 +19,13 @@ class Analytics {
 
   /// Called whenever an Observatory page is viewed.
   static Future reportPageView(Uri uri) {
-    // The screen name is the uri's path. e.g. inspect, profile.
-    final screenName = uri.path;
-    return _googleAnalytics.sendScreenView(screenName);
+    // Only report analytics when running in JavaScript.
+    if (Utils.runningInJavaScript()) {
+      // The screen name is the uri's path. e.g. inspect, profile.
+      final screenName = uri.path;
+      return _googleAnalytics.sendScreenView(screenName);
+    } else {
+      return new Future.value(null);
+    }
   }
 }