[Chromoting] Log mouse events in remoting_key_tester

remoting/tools/javascript_key_tester/main.css

Index: remoting/tools/javascript_key_tester/main.css
diff --git a/remoting/tools/javascript_key_tester/main.css b/remoting/tools/javascript_key_tester/main.css
index 46945e0b9c6c974c85bdb27e776c556f072bd358..5a6975566f0ce3a6c8aeb02945976bcf5c98fac9 100644
--- a/remoting/tools/javascript_key_tester/main.css
+++ b/remoting/tools/javascript_key_tester/main.css
@@ -34,7 +34,13 @@ html {
 }
 
 #pnacl-listener {
-  height: 0;
+  height: 100px;
+}
+
+#pnacl-plugin {
+  height: 100%;
+  width: 100%;
+  background-color: gray;
 }
 
 .selectable {
@@ -100,4 +106,4 @@ html {
   position: absolute;
   right: 8px;
   top: 8px;
-}
+}