Allow dynamic switching in and out of sidetabs mode.

chrome/browser/tabs/tab_strip_model.cc

Index: chrome/browser/tabs/tab_strip_model.cc
===================================================================
--- chrome/browser/tabs/tab_strip_model.cc	(revision 41630)
+++ chrome/browser/tabs/tab_strip_model.cc	(working copy)
@@ -574,15 +574,28 @@
       return delegate_->CanRestoreTab();
     case CommandTogglePinned:
       return true;
-    case CommandBookmarkAllTabs: {
+    case CommandBookmarkAllTabs:
       return delegate_->CanBookmarkAllTabs();
-    }
+    case CommandUseVerticalTabs:
+      return true;
     default:
       NOTREACHED();
   }
   return false;
 }
 
+bool TabStripModel::IsContextMenuCommandChecked(int context_index,
+                                                ContextMenuCommand command_id) const {

[sky, 2010/03/19 16:14:02]

nit: > 80

+  switch (command_id) {
+    case CommandUseVerticalTabs:
+      return delegate()->UseVerticalTabs();
+    default:
+      NOTREACHED();
+      break;
+  }
+  return false;
+}
+
 void TabStripModel::ExecuteContextMenuCommand(
     int context_index, ContextMenuCommand command_id) {
   DCHECK(command_id > CommandFirst && command_id < CommandLast);
@@ -656,6 +669,12 @@
       delegate_->BookmarkAllTabs();
       break;
     }
+    case CommandUseVerticalTabs: {
+      UserMetrics::RecordAction("TabContextMenu_UseVerticalTabs", profile_);
+
+      delegate()->ToggleUseVerticalTabs();
+      break;
+    }
     default:
       NOTREACHED();
   }