Add some browser tests for net-internals

chrome/browser/resources/net_internals/browser_bridge.js

Index: chrome/browser/resources/net_internals/browser_bridge.js
===================================================================
--- chrome/browser/resources/net_internals/browser_bridge.js	(revision 94938)
+++ chrome/browser/resources/net_internals/browser_bridge.js	(working copy)
@@ -66,6 +66,9 @@
     // and no messages will be sent to the browser, either.  Intended for use
     // when viewing log files.
     this.disabled_ = false;
+
+    // Interval id returned by window.setInterval for polling timer.
+    this.pollIntervalId_ = null;
   }
 
   cr.addSingletonGetter(BrowserBridge);
@@ -93,12 +96,27 @@
 
     sendReady: function() {
       this.send('notifyReady');
+      this.setPollInterval(POLL_INTERVAL_MS);
+    },
 
-      // Some of the data we are interested is not currently exposed as a
-      // stream, so we will poll the browser to find out when it changes and
-      // then notify the observers.
-      window.setInterval(this.checkForUpdatedInfo.bind(this, false),
-                         POLL_INTERVAL_MS);
+    /**
+     * Some of the data we are interested is not currently exposed as a
+     * stream.  This starts polling those with active observers (visible
+     * views) every |intervalMs|.  Subsequent calls override previous calls
+     * to this function.  If |intervalMs| is 0, stops polling.  Function only
+     * exposed for unit testing.
+     */
+    setPollInterval: function(intervalMs) {
+      if (this.pollIntervalId_ !== null) {
+        window.clearInterval(this.pollIntervalId_);
+        this.pollIntervalId_ = null;
+      }
+
+      if (intervalMs > 0) {
+        this.pollIntervalId_ =
+            window.setInterval(this.checkForUpdatedInfo.bind(this, false),
+                               intervalMs);
+      }
     },
 
     sendGetProxySettings: function() {