Sync app order for extension items

chrome/browser/ui/app_list/extension_app_item.cc

 // 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.
 
 #include "chrome/browser/ui/app_list/extension_app_item.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_sorting.h"
@@ skipping 126 matching lines @@
     const color_utils::HSL shift = {-1, 0, 0.6};
     icon = gfx::ImageSkiaOperations::CreateHSLShiftedImage(icon, shift);
   }
 
   if (HasOverlay())
     icon = gfx::ImageSkia(new ShortcutOverlayImageSource(icon), icon.size());
 
   SetIcon(icon, !HasOverlay());
 }
 
+void ExtensionAppItem::Move(const ExtensionAppItem* prev,
+                            const ExtensionAppItem* next) {
+  if (!prev && !next)
+    return;  // No reordering necessary
+
+  ExtensionService* service =
+      extensions::ExtensionSystem::Get(profile_)->extension_service();
+  ExtensionSorting* sorting = service->extension_prefs()->extension_sorting();
+
+  syncer::StringOrdinal page;
+  std::string prev_id, next_id;
+  if (!prev) {
+    next_id = next->extension_id();
+    page = sorting->GetPageOrdinal(next_id);
+  } else if (!next) {
+    prev_id = prev->extension_id();
+    page = sorting->GetPageOrdinal(prev_id);
+  } else {
+    prev_id = prev->extension_id();
+    page = sorting->GetPageOrdinal(prev_id);
+    // Only set |next_id| if on the same page, otherwise just insert after prev.
+    if (page.Equals(sorting->GetPageOrdinal(next->extension_id())))
+      next_id = next->extension_id();
+  }
+  service->extension_prefs()->SetAppDraggedByUser(extension_id_);
+  sorting->SetPageOrdinal(extension_id_, page);
+  service->OnExtensionMoved(extension_id_, prev_id, next_id);
+}
+
 const Extension* ExtensionAppItem::GetExtension() const {
   const ExtensionService* service =
       extensions::ExtensionSystem::Get(profile_)->extension_service();
   const Extension* extension = service->GetInstalledExtension(extension_id_);
   return extension;
 }
 
 void ExtensionAppItem::LoadImage(const Extension* extension) {
   icon_.reset(new extensions::IconImage(
       profile_,
@@ skipping 89 matching lines @@
 // static
 const char ExtensionAppItem::kAppType[] = "ExtensionAppItem";
 
 const char* ExtensionAppItem::GetAppType() const {
   return ExtensionAppItem::kAppType;
 }
 
 void ExtensionAppItem::ExecuteLaunchCommand(int event_flags) {
   Launch(event_flags);
 }