[refactor] Split up SourceTracker into SourceTracker + EventsTracker.

chrome/browser/resources/net_internals/timeline_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.
 
 /**
  * TimelineView displays a zoomable and scrollable graph of a number of values
  * over time.  The TimelineView class itself is responsible primarily for
  * updating the TimelineDataSeries its GraphView displays.
  */
 var TimelineView = (function() {
@@ skipping 33 matching lines @@
 
     // DataSeries depend on some of the global constants, so they're only
     // created once constants have been received.  We also use this message to
     // recreate DataSeries when log files are being loaded.
     g_browser.addConstantsObserver(this);
 
     // We observe new log entries to determine the range of the graph, and pass
     // them on to each DataSource.  We initialize the graph range to initially
     // include all events, but after that, we only update it to be the current
     // time on a timer.
-    g_browser.sourceTracker.addLogEntryObserver(this);
+    EventsTracker.getInstance().addLogEntryObserver(this);
     this.graphRangeInitialized_ = false;
   }
 
   // ID for special HTML element in category_tabs.html
   TimelineView.TAB_HANDLE_ID = 'tab-handle-timeline';
 
   // IDs for special HTML elements in timeline_view.html
   TimelineView.GRAPH_DIV_ID = 'timeline-view-graph-div';
   TimelineView.GRAPH_CANVAS_ID = 'timeline-view-graph-canvas';
   TimelineView.SELECTION_DIV_ID = 'timeline-view-selection-div';
@@ skipping 159 matching lines @@
     },
 
     /**
      * When we receive the constants, create or recreate the DataSeries.
      */
     onReceivedConstants: function(constants) {
       this.createDataSeries_();
     },
 
     /**
-     * When log entries are deleted, simpler to recreate the DataSeries, rather
-     * than clearing them.
+     * When all log entries are deleted, recreate the DataSeries.
      */
     onAllLogEntriesDeleted: function() {
       this.graphRangeInitialized_ = false;
       this.createDataSeries_();
     },
 
     onReceivedLogEntries: function(entries) {
       // Pass each entry to every DataSeries, one at a time.  Not having each
-      // data series get data directly from the SourceTracker saves us from
+      // data series get data directly from the EventsTracker saves us from
       // having very un-Javascript-like destructors for when we load new,
       // constants and slightly simplifies DataSeries objects.
       for (var entry = 0; entry < entries.length; ++entry) {
         for (var i = 0; i < this.dataSeries_.length; ++i)
           this.dataSeries_[i].onReceivedLogEntry(entries[entry]);
       }
 
       // If this is the first non-empty set of entries we've received, or we're
       // viewing a loaded log file, we will need to update the date range.
       if (this.graphRangeInitialized_ && !MainView.isViewingLoadedLog())
@@ skipping 35 matching lines @@
       this.leftView_.setGeometry(0, 0, newWidth, 100);
 
       // Force a re-layout now that the left view has changed width.
       this.setGeometry(this.getLeft(), this.getTop(), this.getWidth(),
                        this.getHeight());
     }
   };
 
   return TimelineView;
 })();