Cope gracefully with scripts querying stats before client has started.

remoting/client/plugin/chromoting_scriptable_object.cc

Index: remoting/client/plugin/chromoting_scriptable_object.cc
diff --git a/remoting/client/plugin/chromoting_scriptable_object.cc b/remoting/client/plugin/chromoting_scriptable_object.cc
index e2b5fe9b10c966809b251f9d8b7575fb00409613..e2c4126a8b890eb13b1d2411b815c468f98a4b48 100644
--- a/remoting/client/plugin/chromoting_scriptable_object.cc
+++ b/remoting/client/plugin/chromoting_scriptable_object.cc
@@ -142,16 +142,17 @@ Var ChromotingScriptableObject::GetProperty(const Var& name, Var* exception) {
 
   // If this is a statistics attribute then return the value from
   // ChromotingStats structure.
+  ChromotingStats* stats = instance_->GetStats();
   if (name.AsString() == kVideoBandwidthAttribute)
-    return instance_->GetStats()->video_bandwidth()->Rate();
+    return stats ? stats->video_bandwidth()->Rate() : Var();
   if (name.AsString() == kVideoCaptureLatencyAttribute)
-    return instance_->GetStats()->video_capture_ms()->Average();
+    return stats ? stats->video_capture_ms()->Average() : Var();
   if (name.AsString() == kVideoEncodeLatencyAttribute)
-    return instance_->GetStats()->video_encode_ms()->Average();
+    return stats ? stats->video_encode_ms()->Average() : Var();
   if (name.AsString() == kVideoDecodeLatencyAttribute)
-    return instance_->GetStats()->video_decode_ms()->Average();
+    return stats ? stats->video_decode_ms()->Average() : Var();
   if (name.AsString() == kVideoRenderLatencyAttribute)
-    return instance_->GetStats()->video_paint_ms()->Average();
+    return stats ? stats->video_paint_ms()->Average() : Var();
 
   // TODO(ajwong): This incorrectly return a null object if a function
   // property is requested.