[refactor] Split up SourceTracker into SourceTracker + EventsTracker.

chrome/browser/resources/net_internals/capture_status_view.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * The status view at the top of the page when in capturing mode.
  */
 var CaptureStatusView = (function() {
   'use strict';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   function CaptureStatusView() {
     superClass.call(this, CaptureStatusView.MAIN_BOX_ID);
 
     $(CaptureStatusView.STOP_BUTTON_ID).onclick = switchToViewOnlyMode_;
 
     $(CaptureStatusView.RESET_BUTTON_ID).onclick =
-        g_browser.sourceTracker.deleteAllSourceEntries.bind(
-            g_browser.sourceTracker);
+        EventsTracker.getInstance().deleteAllLogEntries.bind(
+            EventsTracker.getInstance());
     $(CaptureStatusView.CLEAR_CACHE_BUTTON_ID).onclick =
         g_browser.sendClearAllCache.bind(g_browser);
     $(CaptureStatusView.FLUSH_SOCKETS_BUTTON_ID).onclick =
         g_browser.sendFlushSocketPools.bind(g_browser);
 
     $(CaptureStatusView.TOGGLE_EXTRAS_ID).onclick =
         this.toggleExtras_.bind(this);
 
     this.capturedEventsCountBox_ =
         $(CaptureStatusView.CAPTURED_EVENTS_COUNT_ID);
     this.updateEventCounts_();
 
-    g_browser.sourceTracker.addSourceEntryObserver(this);
+    EventsTracker.getInstance().addLogEntryObserver(this);
   }
 
   // IDs for special HTML elements in status_view.html
   CaptureStatusView.MAIN_BOX_ID = 'capture-status-view';
   CaptureStatusView.STOP_BUTTON_ID = 'capture-status-view-stop';
   CaptureStatusView.RESET_BUTTON_ID = 'capture-status-view-reset';
   CaptureStatusView.CLEAR_CACHE_BUTTON_ID = 'capture-status-view-clear-cache';
   CaptureStatusView.FLUSH_SOCKETS_BUTTON_ID =
       'capture-status-view-flush-sockets';
   CaptureStatusView.CAPTURED_EVENTS_COUNT_ID =
       'capture-status-view-captured-events-count';
   CaptureStatusView.TOGGLE_EXTRAS_ID = 'capture-status-view-toggle-extras';
   CaptureStatusView.EXTRAS_ID = 'capture-status-view-extras';
 
   CaptureStatusView.prototype = {
     // Inherit the superclass's methods.
     __proto__: superClass.prototype,
 
     /**
-     * Called whenever a new event is received.
+     * Called whenever new log entries have been received.
      */
-    onSourceEntriesUpdated: function(sourceEntries) {
+    onReceivedLogEntries: function(logEntries) {
       this.updateEventCounts_();
     },
 
     /**
      * Called whenever all log events are deleted.
      */
-    onAllSourceEntriesDeleted: function() {
+    onAllLogEntriesDeleted: function() {
       this.updateEventCounts_();
     },
 
     /**
      * Updates the counters showing how many events have been captured.
      */
     updateEventCounts_: function() {
       this.capturedEventsCountBox_.textContent =
-          g_browser.sourceTracker.getNumCapturedEvents();
+          EventsTracker.getInstance().getNumCapturedEvents();
     },
 
     /**
      * Toggles the visibility of the "extras" action bar.
      */
     toggleExtras_: function() {
       var toggle = $(CaptureStatusView.TOGGLE_EXTRAS_ID);
       var extras = $(CaptureStatusView.EXTRAS_ID);
 
       var isVisible = extras.style.display == '';
 
       // Toggle between the left-facing triangle and right-facing triange.
       toggle.className = isVisible ?
           'capture-status-view-rotateleft' : 'capture-status-view-rotateright';
       setNodeDisplay(extras, !isVisible);
     }
   };
 
   /**
    * Calls the corresponding function of MainView.  This is needed because we
    * can't call MainView.getInstance() in the constructor, as it hasn't been
    * created yet.
    */
   function switchToViewOnlyMode_() {
     MainView.getInstance().switchToViewOnlyMode();
   }
 
   return CaptureStatusView;
 })();