mash: Support ShelfModel access in Chrome.

ash/shelf/shelf_model_unittest.cc

 // Copyright 2013 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 "ash/shelf/shelf_model.h"
 
 #include <set>
 #include <string>
 
 #include "ash/shelf/shelf_model_observer.h"
@@ skipping 21 matching lines @@
     AddToResult("moved=%d", moved_count_, &result);
     added_count_ = removed_count_ = changed_count_ = moved_count_ = 0;
     return result;
   }
 
   // ShelfModelObserver overrides:
   void ShelfItemAdded(int) override { added_count_++; }
   void ShelfItemRemoved(int, const ShelfItem&) override { removed_count_++; }
   void ShelfItemChanged(int, const ShelfItem&) override { changed_count_++; }
   void ShelfItemMoved(int, int) override { moved_count_++; }
+  void ShelfItemDelegateChanged(const ShelfID&, ShelfItemDelegate*) override {}
 
  private:
   void AddToResult(const std::string& format, int count, std::string* result) {
     if (!count)
       return;
     if (!result->empty())
       *result += " ";
     *result += base::StringPrintf(format.c_str(), count);
   }
 
@@ skipping 372 matching lines @@
 
   // Unpinning the same app id again should have no change.
   model_->UnpinAppWithID(app_id);
   EXPECT_FALSE(model_->IsAppPinned(app_id));
   EXPECT_EQ(2, model_->item_count());
   EXPECT_EQ(TYPE_APP, model_->items()[index].type);
   EXPECT_EQ(item.id, model_->items()[index].id);
 }
 
 }  // namespace ash