Added the Ash.Tab.TimeBetweenSwitchToExistingTabUserActions histogram to track time between tab swit

chrome/browser/ui/browser_commands.cc

 // Copyright 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.
 
 #include "chrome/browser/ui/browser_commands.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 525 matching lines @@
   browser->window()->Close();
 }
 
 void NewTab(Browser* browser) {
   content::RecordAction(UserMetricsAction("NewTab"));
   // TODO(asvitkine): This is invoked programmatically from several places.
   // Audit the code and change it so that the histogram only gets collected for
   // user-initiated commands.
   UMA_HISTOGRAM_ENUMERATION("Tab.NewTab", TabStripModel::NEW_TAB_COMMAND,
                             TabStripModel::NEW_TAB_ENUM_COUNT);
+  // TODO(bruthig):
 
   if (browser->is_type_tabbed()) {
     AddTabAt(browser, GURL(), -1, true);
     browser->tab_strip_model()->GetActiveWebContents()->RestoreFocus();
   } else {
     ScopedTabbedBrowserDisplayer displayer(browser->profile(),
                                            browser->host_desktop_type());
     Browser* b = displayer.browser();
     AddTabAt(b, GURL(), -1, true);
     b->window()->Show();
@@ skipping 57 matching lines @@
 
 void MoveTabPrevious(Browser* browser) {
   content::RecordAction(UserMetricsAction("MoveTabPrevious"));
   browser->tab_strip_model()->MoveTabPrevious();
 }
 
 void SelectNumberedTab(Browser* browser, int index) {
   if (index < browser->tab_strip_model()->count()) {
     content::RecordAction(UserMetricsAction("SelectNumberedTab"));
     browser->tab_strip_model()->ActivateTabAt(index, true);
+    // TODO(bruthig):
   }
 }
 
 void SelectLastTab(Browser* browser) {
   content::RecordAction(UserMetricsAction("SelectLastTab"));
   browser->tab_strip_model()->SelectLastTab();
 }
 
 void DuplicateTab(Browser* browser) {
   content::RecordAction(UserMetricsAction("Duplicate"));
@@ skipping 642 matching lines @@
                                           browser->host_desktop_type()));
   app_browser->tab_strip_model()->AppendWebContents(contents, true);
 
   contents->GetMutableRendererPrefs()->can_accept_load_drops = false;
   contents->GetRenderViewHost()->SyncRendererPrefs();
   app_browser->window()->Show();
 }
 #endif  // defined(ENABLE_EXTENSIONS)
 
 }  // namespace chrome