Remove about:tracking.

chrome/browser/resources/profiler.js

 // Copyright (c) 2011 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.
 
 var g_browserBridge;
 var g_mainView;
 
 // TODO(eroman): Don't repeat the work of grouping, sorting, merging on every
 //               redraw. Rather do it only once when one of its dependencies
 //               change and cache the result.
@@ skipping 81 matching lines @@
   // The anchor which toggles visibility of column checkboxes.
   var EDIT_COLUMNS_LINK_ID = 'edit-columns-link';
 
   // The container node to show/hide when toggling the column checkboxes.
   var EDIT_COLUMNS_ROW = 'edit-columns-row';
 
   // The checkbox which controls whether things like "Worker Threads" and
   // "PAC threads" will be merged together.
   var MERGE_SIMILAR_THREADS_CHECKBOX_ID = 'merge-similar-threads-checkbox';
 
+  var RESET_DATA_LINK_ID = 'reset-data-link';
+
   // --------------------------------------------------------------------------
   // Row keys
   // --------------------------------------------------------------------------
 
   // Each row of our data is an array of values rather than a dictionary. This
   // avoids some overhead from repeating the key string multiple times, and
   // speeds up the property accesses a bit. The following keys are well-known
   // indexes into the array for various properties.
   //
   // Note that the declaration order will also define the default display order.
@@ skipping 1078 matching lines @@
         newRow[KEY_PROCESS_TYPE] = ptype;
 
         // Copy over the known properties which have a 1:1 mapping with JSON.
         for (var k = BEGIN_KEY; k < END_KEY; ++k) {
           var inputJsonKey = KEY_PROPERTIES[k].inputJsonKey;
           if (inputJsonKey != undefined) {
             newRow[k] = getPropertyByPath(origRow, inputJsonKey);
           }
         }
 
+        if (newRow[KEY_COUNT] == 0) {
+          // When resetting the data, it is possible for the backend to give us
+          // counts of "0". There is no point adding these rows (in fact they
+          // will cause us to do divide by zeros when calculating averages and
+          // stuff), so we skip past them.
+          continue;
+        }
+
         // Add our computed properties.
         augmentDataRow(newRow);
 
         this.allData_.push(newRow);
       }
 
       this.redrawData_();
     },
 
     redrawData_: function() {
@@ skipping 56 matching lines @@
       this.currentSortKeys_ = INITIAL_SORT_KEYS.slice(0);
       this.currentGroupingKeys_ = INITIAL_GROUP_KEYS.slice(0);
 
       this.fillGroupingDropdowns_();
       this.fillSortingDropdowns_();
 
       $(EDIT_COLUMNS_LINK_ID).onclick = this.toggleEditColumns_.bind(this);
 
       $(MERGE_SIMILAR_THREADS_CHECKBOX_ID).onchange =
           this.onMergeSimilarThreadsCheckboxChanged_.bind(this);
+
+      $(RESET_DATA_LINK_ID).onclick =
+          g_browserBridge.sendResetData.bind(g_browserBridge);
     },
 
     toggleEditColumns_: function() {
       var n = $(EDIT_COLUMNS_ROW);
       if (n.style.display == '') {
         n.style.display = 'none';
       } else {
         n.style.display = '';
       }
     },
@@ skipping 252 matching lines @@
           groupKey.push(entry);
         }
 
         return JSON.stringify(groupKey);
       };
     },
   };
 
   return MainView;
 })();