Provide stdout and stderr output in the Observatory debugger.

runtime/observatory/lib/src/elements/debugger.html

Index: runtime/observatory/lib/src/elements/debugger.html
diff --git a/runtime/observatory/lib/src/elements/debugger.html b/runtime/observatory/lib/src/elements/debugger.html
index 08948cf68a9656c49a494fb345d94a1dbe23c587..2674e82bd2c90f81c21676d42d3ee58299a96d3e 100644
--- a/runtime/observatory/lib/src/elements/debugger.html
+++ b/runtime/observatory/lib/src/elements/debugger.html
@@ -420,13 +420,18 @@
         line-height: 125%;
         color: red;
       }
+      .green {
+        font: normal 14px consolas, courier, monospace;
+        white-space: pre;
+        line-height: 125%;
+        color: green;
+      }
       .spacer {
         height: 20px;
       }
     </style>
     <div id="consoleText" class="console">
-      <!-- Console output is added programmatically here using the 'normal'
-           and 'bold' styles. -->
+      <!-- Console output is added programmatically -->
     </div>
   </template>
 </polymer-element>