dbus-vis: Fix counts for overlapped entries

For dbus method calls that overlap in time, the Render() routine used to
only report counts from the last row. This has been corrected such that
the sum of the counts from all rows belonging to the same same are added
together.

Signed-off-by: Sui Chen <suichen@google.com>
Change-Id: I6c87a0f52c6ab766ecd452305f989ad819b886a5
diff --git a/dbus-vis/dbus_pcap_loader.js b/dbus-vis/dbus_pcap_loader.js
index adbdec0..9118cb3 100644
--- a/dbus-vis/dbus_pcap_loader.js
+++ b/dbus-vis/dbus_pcap_loader.js
@@ -62,7 +62,7 @@
     });
 
     dbus_pcap1.stderr.on('data', (data) => {
-      console.err(data.toString());
+      console.error(data.toString());
     });
 
     dbus_pcap1.on('close', (code) => {
@@ -95,7 +95,7 @@
       });
 
       dbus_pcap2.stderr.on('data', (data) => {
-        console.err(data.toString());
+        console.error(data.toString());
       });
 
       dbus_pcap2.on('close', (code) => {